NJMAC Visualization
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Transcript of NJMAC Visualization
© Joan A. Cotter, Ph.D., 2012
NJMAC ConferenceMarch 2, 2012
Edison, New Jersey
by Joan A. Cotter, [email protected]
Enriching Montessori Mathematics with Visualization
Presentations available: rightstartmath.com
7 x 71000
101
100 53
52
© Joan A. Cotter, Ph.D., 20122
Verbal Counting Model
© Joan A. Cotter, Ph.D., 20123
Verbal Counting ModelFrom a child's perspective
Because we’re so familiar with 1, 2, 3, we’ll use letters.
A = 1B = 2C = 3D = 4E = 5, and so forth
© Joan A. Cotter, Ph.D., 20124
Verbal Counting Model From a child's perspective
F + E
© Joan A. Cotter, Ph.D., 20125
Verbal Counting Model From a child's perspective
A
F + E
© Joan A. Cotter, Ph.D., 20126
Verbal Counting Model From a child's perspective
A B
F + E
© Joan A. Cotter, Ph.D., 20127
Verbal Counting Model From a child's perspective
A CB
F + E
© Joan A. Cotter, Ph.D., 20128
Verbal Counting Model From a child's perspective
A FC D EB
F + E
© Joan A. Cotter, Ph.D., 20129
Verbal Counting Model From a child's perspective
AA FC D EB
F + E
© Joan A. Cotter, Ph.D., 201210
Verbal Counting Model From a child's perspective
A BA FC D EB
F + E
© Joan A. Cotter, Ph.D., 201211
Verbal Counting Model From a child's perspective
A C D EBA FC D EB
F + E
© Joan A. Cotter, Ph.D., 201212
Verbal Counting Model From a child's perspective
A C D EBA FC D EB
F + E
What is the sum?(It must be a letter.)
© Joan A. Cotter, Ph.D., 201213
Verbal Counting Model From a child's perspective
K
G I J KHA FC D EB
F + E
© Joan A. Cotter, Ph.D., 201214
Verbal Counting Model From a child's perspective
Now memorize the facts!!
G + D
© Joan A. Cotter, Ph.D., 201215
Verbal Counting Model From a child's perspective
Now memorize the facts!!
G + D
H + F
© Joan A. Cotter, Ph.D., 201216
Verbal Counting Model From a child's perspective
Now memorize the facts!!
G + D
H + F
D + C
© Joan A. Cotter, Ph.D., 201217
Verbal Counting Model From a child's perspective
Now memorize the facts!!
G + D
H + F
C + G
D + C
© Joan A. Cotter, Ph.D., 201218
Verbal Counting Model From a child's perspective
E + I
Now memorize the facts!!
G + D
H + F
C + G
D + C
© Joan A. Cotter, Ph.D., 201219
Verbal Counting Model From a child's perspective
Try subtractingby “taking away”
H – E
© Joan A. Cotter, Ph.D., 201220
Verbal Counting Model From a child's perspective
Try skip counting by B’s to T: B, D, . . . T.
© Joan A. Cotter, Ph.D., 201221
Verbal Counting Model From a child's perspective
Try skip counting by B’s to T: B, D, . . . T.
What is D E?
© Joan A. Cotter, Ph.D., 201222
Verbal Counting Model From a child's perspective
Lis written ABbecause it is A J and B A’s
© Joan A. Cotter, Ph.D., 201223
Verbal Counting Model From a child's perspective
Lis written ABbecause it is A J and B A’s
huh?
© Joan A. Cotter, Ph.D., 201224
Verbal Counting Model From a child's perspective
Lis written ABbecause it is A J and B A’s
(twelve)
© Joan A. Cotter, Ph.D., 201225
Verbal Counting Model From a child's perspective
Lis written ABbecause it is A J and B A’s
(12)(twelve)
© Joan A. Cotter, Ph.D., 201226
Verbal Counting Model From a child's perspective
Lis written ABbecause it is A J and B A’s
(12)(one 10)
(twelve)
© Joan A. Cotter, Ph.D., 201227
Verbal Counting Model From a child's perspective
Lis written ABbecause it is A J and B A’s
(12)(one 10)
(two 1s).
(twelve)
© Joan A. Cotter, Ph.D., 201228
Verbal Counting ModelSummary
© Joan A. Cotter, Ph.D., 201229
Verbal Counting Model
• Is not natural; it takes years of practice.Summary
© Joan A. Cotter, Ph.D., 201230
Verbal Counting Model
• Is not natural; it takes years of practice.
• Provides poor concept of quantity.
Summary
© Joan A. Cotter, Ph.D., 201231
Verbal Counting Model
• Is not natural; it takes years of practice.
• Provides poor concept of quantity.
• Ignores place value.
Summary
© Joan A. Cotter, Ph.D., 201232
Verbal Counting Model
• Is not natural; it takes years of practice.
• Provides poor concept of quantity.
• Ignores place value.
• Is very error prone.
Summary
© Joan A. Cotter, Ph.D., 201233
Verbal Counting Model
• Is not natural; it takes years of practice.
• Provides poor concept of quantity.
• Ignores place value.
• Is very error prone.
• Is tedious and time-consuming.
Summary
© Joan A. Cotter, Ph.D., 201234
Verbal Counting Model
• Is not natural; it takes years of practice.
• Provides poor concept of quantity.
• Ignores place value.
• Is very error prone.
• Is tedious and time-consuming.
Summary
• Does not provide an efficient way to master the facts.
© Joan A. Cotter, Ph.D., 201235
Calendar MathAugust
29
22
15
8
1
30
23
16
9
2
24
17
10
3
25
18
11
4
26
19
12
5
27
20
13
6
28
21
14
7
31
Sometimes calendars are used for counting.
© Joan A. Cotter, Ph.D., 201236
Calendar MathAugust
29
22
15
8
1
30
23
16
9
2
24
17
10
3
25
18
11
4
26
19
12
5
27
20
13
6
28
21
14
7
31
Sometimes calendars are used for counting.
© Joan A. Cotter, Ph.D., 201237
Calendar MathAugust
29
22
15
8
1
30
23
16
9
2
24
17
10
3
25
18
11
4
26
19
12
5
27
20
13
6
28
21
14
7
31
© Joan A. Cotter, Ph.D., 201238
Calendar MathAugust
29
22
15
8
1
30
23
16
9
2
24
17
10
3
25
18
11
4
26
19
12
5
27
20
13
6
28
21
14
7
31
This is ordinal, not cardinal counting. The 3 doesn’t include the 1 and the 2.
© Joan A. Cotter, Ph.D., 201239
Calendar MathSeptember123489101115161718222324252930
567121314192021262728
August
29
22
15
8
1
30
23
16
9
2
24
17
10
3
25
18
11
4
26
19
12
5
27
20
13
6
28
21
14
7
31
This is ordinal, not cardinal counting. The 4 doesn’t include 1, 2 and 3.
© Joan A. Cotter, Ph.D., 201240
Calendar MathSeptember123489101115161718222324252930
567121314192021262728
August
29
22
15
8
1
30
23
16
9
2
24
17
10
3
25
18
11
4
26
19
12
5
27
20
13
6
28
21
14
7
31
1 2 3 4 5 6
A calendar is NOT a ruler. On a ruler the numbers are not in the spaces.
© Joan A. Cotter, Ph.D., 201241
Calendar MathAugust
8
1
9
2
10
3 4 5 6 7
Always show the whole calendar. A child needs to see the whole before the parts. Children also need to learn to plan ahead.
© Joan A. Cotter, Ph.D., 201242
Calendar Math The calendar is not a number line.
• No quantity is involved.• Numbers are in spaces, not at lines like a ruler.
© Joan A. Cotter, Ph.D., 201243
Calendar Math The calendar is not a number line.
• No quantity is involved.• Numbers are in spaces, not at lines like a ruler.
Children need to see the whole month, not just part.• Purpose of calendar is to plan ahead.• Many ways to show the current date.
© Joan A. Cotter, Ph.D., 201244
Calendar Math The calendar is not a number line.
• No quantity is involved.• Numbers are in spaces, not at lines like a ruler.
Children need to see the whole month, not just part.• Purpose of calendar is to plan ahead.• Many ways to show the current date.
Calendars give a narrow view of patterning.• Patterns do not necessarily involve numbers.• Patterns rarely proceed row by row.• Patterns go on forever; they don’t stop at 31.
© Joan A. Cotter, Ph.D., 2012
• Are often used to teach rote.
• Are liked only by those who don’t need them.
• Don’t work for those with learning disabilities.
• Give the false impression that math isn’t about thinking.
• Often produce stress – children under stress stop learning.
• Are not concrete – use abstract symbols.
Memorizing Math 9 + 7Flash cards:
© Joan A. Cotter, Ph.D., 2012
Learning ArithmeticCompared to reading:
Show the baby two teddy bears.
• A child learns to read.
• Later a child uses reading to learn.
• A child learns to do arithmetic.
• Later a child uses arithmetic to solve problems.
© Joan A. Cotter, Ph.D., 2012
Research on CountingKaren Wynn’s research
Show the baby two teddy bears.
© Joan A. Cotter, Ph.D., 2012
Research on CountingKaren Wynn’s research
Show the baby two teddy bears.
© Joan A. Cotter, Ph.D., 201249
Research on Counting
Karen Wynn’s research
Then hide them with a screen.
© Joan A. Cotter, Ph.D., 201250
Research on Counting
Karen Wynn’s research
Show the baby a third teddy bear and put it behind the screen.
© Joan A. Cotter, Ph.D., 201251
Research on Counting
Karen Wynn’s research
Show the baby a third teddy bear and put it behind the screen.
© Joan A. Cotter, Ph.D., 201252
Research on CountingKaren Wynn’s research
Raise screen. Baby seeing 3 won’t look long because it is expected.
© Joan A. Cotter, Ph.D., 201253
Research on Counting
Karen Wynn’s research
Researcher can change the number of teddy bears behind the screen.
© Joan A. Cotter, Ph.D., 201254
Research on CountingKaren Wynn’s research
A baby seeing 1 teddy bear will look much longer, because it’s unexpected.
© Joan A. Cotter, Ph.D., 201255
Research on CountingOther research
© Joan A. Cotter, Ph.D., 201256
Research on Counting
• Australian Aboriginal children from two tribes.Brian Butterworth, University College London, 2008.
Other research
These groups matched quantities without using counting words.
© Joan A. Cotter, Ph.D., 201257
Research on Counting
• Australian Aboriginal children from two tribes.Brian Butterworth, University College London, 2008.
• Adult Pirahã from Amazon region.Edward Gibson and Michael Frank, MIT, 2008.
Other research
These groups matched quantities without using counting words.
© Joan A. Cotter, Ph.D., 201258
Research on Counting
• Australian Aboriginal children from two tribes.Brian Butterworth, University College London, 2008.
• Adult Pirahã from Amazon region.Edward Gibson and Michael Frank, MIT, 2008.
• Adults, ages 18-50, from Boston.Edward Gibson and Michael Frank, MIT, 2008.
Other research
These groups matched quantities without using counting words.
© Joan A. Cotter, Ph.D., 201259
Research on Counting
• Australian Aboriginal children from two tribes.Brian Butterworth, University College London, 2008.
• Adult Pirahã from Amazon region.Edward Gibson and Michael Frank, MIT, 2008.
• Adults, ages 18-50, from Boston.Edward Gibson and Michael Frank, MIT, 2008.
• Baby chicks from Italy.Lucia Regolin, University of Padova, 2009.
Other research
These groups matched quantities without using counting words.
© Joan A. Cotter, Ph.D., 201260
Research on CountingIn Japanese schools:
• Children are discouraged from using counting for adding.
© Joan A. Cotter, Ph.D., 201261
Research on CountingIn Japanese schools:
• Children are discouraged from using counting for adding.
• They consistently group in 5s.
© Joan A. Cotter, Ph.D., 201262
Research on CountingSubitizing
• Subitizing is quick recognition of quantity without counting.
© Joan A. Cotter, Ph.D., 201263
Research on CountingSubitizing
• Subitizing is quick recognition of quantity without counting.• Human babies and some animals can subitize small quantities at birth.
© Joan A. Cotter, Ph.D., 201264
Research on CountingSubitizing
• Subitizing is quick recognition of quantity without counting.• Human babies and some animals can subitize small quantities at birth.• Children who can subitize perform better in mathematics long term.—Butterworth
© Joan A. Cotter, Ph.D., 201265
Research on CountingSubitizing
• Subitizing is quick recognition of quantity without counting.• Human babies and some animals can subitize small quantities at birth.• Children who can subitize perform better in mathematics long term.—Butterworth
• Subitizing “allows the child to grasp the whole and the elements at the same time.”—Benoit
© Joan A. Cotter, Ph.D., 201266
Research on CountingSubitizing
• Subitizing is quick recognition of quantity without counting.• Human babies and some animals can subitize small quantities at birth.• Children who can subitize perform better in mathematics long term.—Butterworth
• Subitizing “allows the child to grasp the whole and the elements at the same time.”—Benoit
• Subitizing seems to be a necessary skill for understanding what the counting process means.—Glasersfeld
© Joan A. Cotter, Ph.D., 201267
Visualizing Mathematics
© Joan A. Cotter, Ph.D., 201268
Visualizing Mathematics
“In our concern about the memorization of math facts or solving problems, we must not forget that the root of mathematical study is the creation of mental pictures in the imagination and manipulating those images and relationships using the power of reason and logic.”
Mindy Holte (E I)
© Joan A. Cotter, Ph.D., 201269
Visualizing Mathematics
“Think in pictures, because the brain remembers images better than it does anything else.”
Ben Pridmore, World Memory Champion, 2009
© Joan A. Cotter, Ph.D., 201270
Visualizing Mathematics
“The role of physical manipulatives was to help the child form those visual images and thus to eliminate the need for the physical manipulatives.”
Ginsberg and others
© Joan A. Cotter, Ph.D., 2012
• Representative of structure of numbers.• Easily manipulated by children.• Imaginable mentally.
Visualizing MathematicsJapanese criteria for manipulatives
Japanese Council ofMathematics Education
© Joan A. Cotter, Ph.D., 2012
Visualizing Mathematics
• Reading• Sports• Creativity• Geography• Engineering• Construction
Visualizing also needed in:
© Joan A. Cotter, Ph.D., 2012
Visualizing Mathematics
• Reading• Sports• Creativity• Geography• Engineering• Construction
• Architecture• Astronomy• Archeology• Chemistry• Physics• Surgery
Visualizing also needed in:
© Joan A. Cotter, Ph.D., 2012
Visualizing MathematicsReady: How many?
© Joan A. Cotter, Ph.D., 2012
Visualizing MathematicsReady: How many?
© Joan A. Cotter, Ph.D., 2012
Visualizing MathematicsTry again: How many?
© Joan A. Cotter, Ph.D., 2012
Visualizing MathematicsTry again: How many?
© Joan A. Cotter, Ph.D., 2012
Visualizing MathematicsTry again: How many?
© Joan A. Cotter, Ph.D., 2012
Visualizing MathematicsReady: How many?
© Joan A. Cotter, Ph.D., 2012
Visualizing MathematicsTry again: How many?
© Joan A. Cotter, Ph.D., 2012
Visualizing MathematicsTry to visualize 8 identical apples without grouping.
© Joan A. Cotter, Ph.D., 2012
Visualizing MathematicsTry to visualize 8 identical apples without grouping.
© Joan A. Cotter, Ph.D., 2012
Visualizing MathematicsNow try to visualize 5 as red and 3 as green.
© Joan A. Cotter, Ph.D., 2012
Visualizing MathematicsNow try to visualize 5 as red and 3 as green.
© Joan A. Cotter, Ph.D., 2012
Visualizing Mathematics
I II III IIII V VIII
1 23458
Early Roman numerals
Romans grouped in fives. Notice 8 is 5 and 3.
© Joan A. Cotter, Ph.D., 201286
Visualizing Mathematics
Who could read the music?
:
Music needs 10 lines, two groups of five.
© Joan A. Cotter, Ph.D., 201287
Very Early ComputationNumerals
In English there are two ways of writing numbers:
Numerals: 3578
© Joan A. Cotter, Ph.D., 201288
Very Early ComputationNumerals
In English there are two ways of writing numbers:
Numerals:
Words: Three thousand five hundred seventy-eight
3578
© Joan A. Cotter, Ph.D., 201289
Very Early ComputationNumerals
In ancient Chinese there was only one way of writing numbers:
3 Th 5 H 7 T 8 U(8 characters)
In English there are two ways of writing numbers:
Numerals:
Words: Three thousand five hundred seventy-eight
3578
© Joan A. Cotter, Ph.D., 201290
Very Early ComputationCalculating rods
Because their characters are cumbersome to use for computing, the Chinese used calculating rods, beginning in the 4th century BC.
© Joan A. Cotter, Ph.D., 201291
Very Early ComputationCalculating rods
© Joan A. Cotter, Ph.D., 201292
Very Early ComputationCalculating rods
Numerals for Ones and Hundreds (Even Powers of Ten)
© Joan A. Cotter, Ph.D., 201293
Very Early ComputationCalculating rods
Numerals for Ones and Hundreds (Even Powers of Ten)
© Joan A. Cotter, Ph.D., 201294
Very Early ComputationCalculating rods
Numerals for Tens and Thousands (Odd Powers of Ten)
Numerals for Ones and Hundreds (Even Powers of Ten)
© Joan A. Cotter, Ph.D., 201295
Very Early ComputationCalculating rods
3578
© Joan A. Cotter, Ph.D., 201296
Very Early ComputationCalculating rods
3578
3578,3578They grouped, not in thousands, but ten-thousands!
© Joan A. Cotter, Ph.D., 2012
Naming QuantitiesUsing fingers
© Joan A. Cotter, Ph.D., 2012
Naming QuantitiesUsing fingers
Naming quantities is a three-period lesson.
© Joan A. Cotter, Ph.D., 2012
Naming QuantitiesUsing fingers
Use left hand for 1-5 because we read from left to right.
© Joan A. Cotter, Ph.D., 2012100
Naming QuantitiesUsing fingers
© Joan A. Cotter, Ph.D., 2012101
Naming QuantitiesUsing fingers
© Joan A. Cotter, Ph.D., 2012102
Naming QuantitiesUsing fingers
Always show 7 as 5 and 2, not for example, as 4 and 3.
© Joan A. Cotter, Ph.D., 2012103
Naming QuantitiesUsing fingers
© Joan A. Cotter, Ph.D., 2012
Naming QuantitiesYellow is the sun.Six is five and one.
Why is the sky so blue?Seven is five and two.
Salty is the sea.Eight is five and three.
Hear the thunder roar.Nine is five and four.
Ducks will swim and dive.Ten is five and five.
–Joan A. Cotter
Yellow is the Sun
Also set to music. Listen and download sheet music from Web site.
© Joan A. Cotter, Ph.D., 2012
Naming QuantitiesRecognizing 5
© Joan A. Cotter, Ph.D., 2012
Naming QuantitiesRecognizing 5
© Joan A. Cotter, Ph.D., 2012
Naming Quantities
5 has a middle; 4 does not.
Recognizing 5
Look at your hand; your middle finger is longer to remind you 5 has a middle.
© Joan A. Cotter, Ph.D., 2012
Naming QuantitiesTally sticks
Lay the sticks flat on a surface, about 1 inch (2.5 cm) apart.
© Joan A. Cotter, Ph.D., 2012109
Naming QuantitiesTally sticks
© Joan A. Cotter, Ph.D., 2012110
Naming QuantitiesTally sticks
© Joan A. Cotter, Ph.D., 2012111
Naming QuantitiesTally sticks
Stick is horizontal, because it won’t fit diagonally and young children have problems with diagonals.
© Joan A. Cotter, Ph.D., 2012112
Naming QuantitiesTally sticks
© Joan A. Cotter, Ph.D., 2012113
Naming QuantitiesTally sticks
Start a new row for every ten.
© Joan A. Cotter, Ph.D., 2012114
Naming Quantities
What is 4 apples plus 3 more apples?
Solving a problem without counting
How would you find the answer without counting?
© Joan A. Cotter, Ph.D., 2012115
Naming Quantities
What is 4 apples plus 3 more apples?
Solving a problem without counting
To remember 4 + 3, the Japanese child is taught to visualize 4 and 3. Then take 1 from the 3 and give it to the 4 to make 5 and 2.
© Joan A. Cotter, Ph.D., 2012
Naming Quantities
1
2
3
4
5
NumberChart
© Joan A. Cotter, Ph.D., 2012
Naming Quantities
1
2
3
4
5
NumberChart
To help the child learn the symbols
© Joan A. Cotter, Ph.D., 2012
Naming Quantities
61
72
83
94
105
NumberChart
To help the child learn the symbols
© Joan A. Cotter, Ph.D., 2012119
Naming Quantities
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Pairing Finger Cards
Use two sets of finger cards and match them.
© Joan A. Cotter, Ph.D., 2012120
Naming Quantities
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Ordering Finger Cards
Putting the finger cards in order.
© Joan A. Cotter, Ph.D., 2012121
Naming Quantities
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10
5 1
Matching Numbers to Finger Cards
Match the number to the finger card.
© Joan A. Cotter, Ph.D., 2012122
Naming Quantities
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9 4Matching Fingers to Number Cards
1 610
2 83 57
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Match the finger card to the number.
© Joan A. Cotter, Ph.D., 2012123
Naming Quantities
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Finger Card Memory game
Use two sets of finger cards and play Memory.
© Joan A. Cotter, Ph.D., 2012124
Naming QuantitiesNumber Rods
© Joan A. Cotter, Ph.D., 2012125
Naming QuantitiesNumber Rods
© Joan A. Cotter, Ph.D., 2012126
Naming QuantitiesNumber Rods
Using different colors.
© Joan A. Cotter, Ph.D., 2012127
Naming QuantitiesSpindle Box
45 dark-colored and 10 light-colored spindles. Could be in separate containers.
© Joan A. Cotter, Ph.D., 2012128
Naming QuantitiesSpindle Box
45 dark-colored and 10 light-colored spindles in two containers.
© Joan A. Cotter, Ph.D., 2012129
Naming QuantitiesSpindle Box
1 2 30 4
The child takes blue spindles with left hand and yellow with right.
© Joan A. Cotter, Ph.D., 2012130
Naming QuantitiesSpindle Box
6 7 85 9
The child takes blue spindles with left hand and yellow with right.
© Joan A. Cotter, Ph.D., 2012131
Naming QuantitiesSpindle Box
6 7 85 9
The child takes blue spindles with left hand and yellow with right.
© Joan A. Cotter, Ph.D., 2012132
Naming QuantitiesSpindle Box
6 7 85 9
The child takes blue spindles with left hand and yellow with right.
© Joan A. Cotter, Ph.D., 2012133
Naming QuantitiesSpindle Box
6 7 85 9
The child takes blue spindles with left hand and yellow with right.
© Joan A. Cotter, Ph.D., 2012134
Naming QuantitiesSpindle Box
6 7 85 9
The child takes blue spindles with left hand and yellow with right.
© Joan A. Cotter, Ph.D., 2012135
6 7 85 9
Naming QuantitiesSpindle Box
The child takes blue spindles with left hand and yellow with right.
© Joan A. Cotter, Ph.D., 2012136
Naming Quantities
“Grouped in fives so the child does not need to count.”
Black and White Bead Stairs
A. M. Joosten
This was the inspiration to group in 5s.
© Joan A. Cotter, Ph.D., 2012
AL AbacusCleared
© Joan A. Cotter, Ph.D., 2012
3
AL AbacusEntering quantities
Quantities are entered all at once, not counted.
© Joan A. Cotter, Ph.D., 2012139
5
AL AbacusEntering quantities
Relate quantities to hands.
© Joan A. Cotter, Ph.D., 2012140
7
AL AbacusEntering quantities
© Joan A. Cotter, Ph.D., 2012141
AL Abacus
10
Entering quantities
© Joan A. Cotter, Ph.D., 2012142
AL AbacusThe stairs
Can use to “count” 1 to 10. Also read quantities on the right side.
© Joan A. Cotter, Ph.D., 2012
AL AbacusAdding
© Joan A. Cotter, Ph.D., 2012
AL AbacusAdding
4 + 3 =
© Joan A. Cotter, Ph.D., 2012
AL AbacusAdding
4 + 3 =
© Joan A. Cotter, Ph.D., 2012
AL AbacusAdding
4 + 3 =
© Joan A. Cotter, Ph.D., 2012
AL AbacusAdding
4 + 3 =
© Joan A. Cotter, Ph.D., 2012
AL AbacusAdding
4 + 3 = 7
Answer is seen immediately, no counting needed.
© Joan A. Cotter, Ph.D., 2012149
Go to the Dump GameAim: To learn the facts that total 10:
1 + 92 + 83 + 74 + 65 + 5
Children use the abacus while playing this “Go Fish” type game.
© Joan A. Cotter, Ph.D., 2012150
Go to the Dump GameAim: To learn the facts that total 10:
1 + 92 + 83 + 74 + 65 + 5
Object of the game: To collect the most pairs that equal ten.
Children use the abacus while playing this “Go Fish” type game.
© Joan A. Cotter, Ph.D., 2012151
Go to the Dump Game
The ways to partition 10.
© Joan A. Cotter, Ph.D., 2012152
Go to the Dump Game
A game viewed from above.
Starting
© Joan A. Cotter, Ph.D., 2012153
7 2 7 9 5
7 42 61 3 8 3 4 9
Go to the Dump Game
Starting
Each player takes 5 cards.
© Joan A. Cotter, Ph.D., 2012154
Go to the Dump Game
7 2 7 9 5
7 42 61 3 8 3 4 9
Does YellowCap have any pairs? [no]
Finding pairs
© Joan A. Cotter, Ph.D., 2012155
Go to the Dump Game
7 2 7 9 5
7 42 61 3 8 3 4 9
Does BlueCap have any pairs? [yes, 1]
Finding pairs
© Joan A. Cotter, Ph.D., 2012156
Go to the Dump Game
7 2 7 9 5
7 42 61 3 8 3 4 9
Does BlueCap have any pairs? [yes, 1]
Finding pairs
© Joan A. Cotter, Ph.D., 2012157
Go to the Dump Game
7 2 7 9 5
7 2 1 3 8 3 4 9
4 6
Does BlueCap have any pairs? [yes, 1]
Finding pairs
© Joan A. Cotter, Ph.D., 2012158
Go to the Dump Game
7 2 7 9 5
7 2 1 3 8 3 4 9
4 6
Does PinkCap have any pairs? [yes, 2]
Finding pairs
© Joan A. Cotter, Ph.D., 2012159
Go to the Dump Game
7 2 7 9 5
7 2 1 3 8 3 4 9
4 6
Does PinkCap have any pairs? [yes, 2]
Finding pairs
© Joan A. Cotter, Ph.D., 2012160
Go to the Dump Game
7 2 7 9 5
2 1 8 3 4 9
4 67 3
Does PinkCap have any pairs? [yes, 2]
Finding pairs
© Joan A. Cotter, Ph.D., 2012161
Go to the Dump Game
Finding pairs
7 2 7 9 5
1 3 4 9
4 62 82 8
Does PinkCap have any pairs? [yes, 2]
© Joan A. Cotter, Ph.D., 2012162
Go to the Dump Game
7 2 7 9 5
1 3 4 9
4 62 82 8
The player asks the player on her left.
Playing
© Joan A. Cotter, Ph.D., 2012163
Go to the Dump GameBlueCap, do you
have a 3?BlueCap, do you
have an 3?
7 2 7 9 5
1 3 4 9
4 62 82 8
The player asks the player on her left.
Playing
© Joan A. Cotter, Ph.D., 2012164
Go to the Dump GameBlueCap, do you
have a 3?BlueCap, do you
have an 3?
7 2 7 9 5
1
3
4 9
4 62 82 8
The player asks the player on her left.
Playing
© Joan A. Cotter, Ph.D., 2012165
Go to the Dump GameBlueCap, do you
have a 3?BlueCap, do you
have an 3?
2 7 9 5
1 4 9
4 62 82 8
7 3
Playing
© Joan A. Cotter, Ph.D., 2012166
Go to the Dump GameBlueCap, do you
have a 3?BlueCap, do you
have an 8?
2 7 9 5
1 4 9
4 62 82 8
7 3
YellowCap gets another turn.
Playing
© Joan A. Cotter, Ph.D., 2012167
Go to the Dump GameBlueCap, do you
have a 3?BlueCap, do you
have an 8?
Go to the dump.
2 7 9 5
1 4 9
4 62 82 8
7 3
YellowCap gets another turn.
Playing
© Joan A. Cotter, Ph.D., 2012168
2
Go to the Dump GameBlueCap, do you
have a 3?BlueCap, do you
have an 8?
Go to the dump.
2 7 9 5
1 4 9
4 62 82 8
7 3
Playing
© Joan A. Cotter, Ph.D., 2012169
Go to the Dump Game
2 2 7 9 5
1 4 9
4 62 82 8
7 3
Playing
© Joan A. Cotter, Ph.D., 2012170
Go to the Dump Game
PinkCap, do youhave a 6?
2 2 7 9 5
1 4 9
4 62 82 8
7 3
Playing
© Joan A. Cotter, Ph.D., 2012171
Go to the Dump Game
PinkCap, do youhave a 6?Go to the dump.
2 2 7 9 5
1 4 9
4 62 82 8
7 3
Playing
© Joan A. Cotter, Ph.D., 2012172
5
Go to the Dump Game
2 2 7 9 5
1 4 9
4 62 82 8
7 3
Playing
© Joan A. Cotter, Ph.D., 2012173
Go to the Dump Game
5
2 2 7 9 5
1 4 9
4 62 82 8
7 3
Playing
© Joan A. Cotter, Ph.D., 2012174
Go to the Dump Game
YellowCap, doyou have a 9?
5
2 2 7 9 5
1 4 9
4 62 82 8
7 3
Playing
© Joan A. Cotter, Ph.D., 2012175
Go to the Dump Game
YellowCap, doyou have a 9?
5
2 2 7 5
1 4 9
4 62 82 8
7 3
Playing
© Joan A. Cotter, Ph.D., 2012176
Go to the Dump Game
YellowCap, doyou have a 9?
5
2 2 7 5
1 4 9
4 62 82 8
7 3
9
Playing
© Joan A. Cotter, Ph.D., 2012177
Go to the Dump Game
5
2 2 7 5
4 9
4 62 81 9
7 3
Playing
© Joan A. Cotter, Ph.D., 2012178
2 9 1 7 7
Go to the Dump Game
Playing
5
2 2 7 5
4 9
4 62 81 9
7 3
PinkCap is not out of the game. Her turn ends, but she takes 5 more cards.
© Joan A. Cotter, Ph.D., 2012179
Go to the Dump Game
Winner?
5 54 6
9 1
© Joan A. Cotter, Ph.D., 2012180
Go to the Dump Game
Winner?
5546
91
No counting. Combine both stacks.
© Joan A. Cotter, Ph.D., 2012181
Go to the Dump Game
Winner?
5546
91
Whose stack is the highest?
© Joan A. Cotter, Ph.D., 2012182
Go to the Dump Game
Next game
No shuffling needed for next game.
© Joan A. Cotter, Ph.D., 2012183
“Math” Way of Naming Numbers
© Joan A. Cotter, Ph.D., 2012184
“Math” Way of Naming Numbers
11 = ten 1
© Joan A. Cotter, Ph.D., 2012185
“Math” Way of Naming Numbers
11 = ten 112 = ten 2
© Joan A. Cotter, Ph.D., 2012186
“Math” Way of Naming Numbers
11 = ten 112 = ten 213 = ten 3
© Joan A. Cotter, Ph.D., 2012187
“Math” Way of Naming Numbers
11 = ten 112 = ten 213 = ten 314 = ten 4
© Joan A. Cotter, Ph.D., 2012188
“Math” Way of Naming Numbers
11 = ten 112 = ten 213 = ten 314 = ten 4 . . . .19 = ten 9
© Joan A. Cotter, Ph.D., 2012189
“Math” Way of Naming Numbers
11 = ten 112 = ten 213 = ten 314 = ten 4 . . . .19 = ten 9
20 = 2-ten
Don’t say “2-tens.” We don’t say 3 hundreds eleven for 311.
© Joan A. Cotter, Ph.D., 2012190
“Math” Way of Naming Numbers
11 = ten 112 = ten 213 = ten 314 = ten 4 . . . .19 = ten 9
20 = 2-ten 21 = 2-ten 1
Don’t say “2-tens.” We don’t say 3 hundreds eleven for 311.
© Joan A. Cotter, Ph.D., 2012191
“Math” Way of Naming Numbers
11 = ten 112 = ten 213 = ten 314 = ten 4 . . . .19 = ten 9
20 = 2-ten 21 = 2-ten 122 = 2-ten 2
Don’t say “2-tens.” We don’t say 3 hundreds eleven for 311.
© Joan A. Cotter, Ph.D., 2012192
“Math” Way of Naming Numbers
11 = ten 112 = ten 213 = ten 314 = ten 4 . . . .19 = ten 9
20 = 2-ten 21 = 2-ten 122 = 2-ten 223 = 2-ten 3
Don’t say “2-tens.” We don’t say 3 hundreds eleven for 311.
© Joan A. Cotter, Ph.D., 2012193
“Math” Way of Naming Numbers
11 = ten 112 = ten 213 = ten 314 = ten 4 . . . .19 = ten 9
20 = 2-ten 21 = 2-ten 122 = 2-ten 223 = 2-ten 3 . . . . . . . .99 = 9-ten 9
© Joan A. Cotter, Ph.D., 2012194
“Math” Way of Naming Numbers
137 = 1 hundred 3-ten 7
Only numbers under 100 need to be said the “math” way.
© Joan A. Cotter, Ph.D., 2012195
“Math” Way of Naming Numbers
137 = 1 hundred 3-ten 7or
137 = 1 hundred and 3-ten 7
Only numbers under 100 need to be said the “math” way.
© Joan A. Cotter, Ph.D., 2012196
“Math” Way of Naming Numbers
0
10
20
30
40
50
60
70
80
90
100
4 5 6Ages (yrs.)
Song, M., & Ginsburg, H. (1988). p. 326. The effect of the Korean number system on young children's counting: A natural experiment in numerical bilingualism. International Journal of Psychology, 23, 319-332.
Korean formal [math way]Korean informal [not explicit]
ChineseU.S.
Shows how far children from 3 countries can count at ages 4, 5, and 6.
Ave
rage
Hig
hest
Num
ber C
ount
ed
© Joan A. Cotter, Ph.D., 2012197
“Math” Way of Naming Numbers
0
10
20
30
40
50
60
70
80
90
100
4 5 6Ages (yrs.)
Song, M., & Ginsburg, H. (1988). p. 326. The effect of the Korean number system on young children's counting: A natural experiment in numerical bilingualism. International Journal of Psychology, 23, 319-332.
Korean formal [math way]Korean informal [not explicit]
ChineseU.S.
Purple is Chinese. Note jump between ages 5 and 6.
Ave
rage
Hig
hest
Num
ber C
ount
ed
© Joan A. Cotter, Ph.D., 2012198
“Math” Way of Naming Numbers
0
10
20
30
40
50
60
70
80
90
100
4 5 6Ages (yrs.)
Song, M., & Ginsburg, H. (1988). p. 326. The effect of the Korean number system on young children's counting: A natural experiment in numerical bilingualism. International Journal of Psychology, 23, 319-332.
Korean formal [math way]Korean informal [not explicit]
ChineseU.S.
Dark green is Korean “math” way.
Ave
rage
Hig
hest
Num
ber C
ount
ed
© Joan A. Cotter, Ph.D., 2012199
“Math” Way of Naming Numbers
0
10
20
30
40
50
60
70
80
90
100
4 5 6Ages (yrs.)
Song, M., & Ginsburg, H. (1988). p. 326. The effect of the Korean number system on young children's counting: A natural experiment in numerical bilingualism. International Journal of Psychology, 23, 319-332.
Korean formal [math way]Korean informal [not explicit]
ChineseU.S.
Dotted green is everyday Korean; notice smaller jump between ages 5 and 6.
Ave
rage
Hig
hest
Num
ber C
ount
ed
© Joan A. Cotter, Ph.D., 2012200
“Math” Way of Naming Numbers
0
10
20
30
40
50
60
70
80
90
100
4 5 6Ages (yrs.)
Song, M., & Ginsburg, H. (1988). p. 326. The effect of the Korean number system on young children's counting: A natural experiment in numerical bilingualism. International Journal of Psychology, 23, 319-332.
Korean formal [math way]Korean informal [not explicit]
ChineseU.S.
Red is English speakers. They learn same amount between ages 4-5 and 5-6.
Ave
rage
Hig
hest
Num
ber C
ount
ed
© Joan A. Cotter, Ph.D., 2012201
Math Way of Naming Numbers• Only 11 words are needed to count to 100 the math way, 28 in English. (All Indo-European languages are non-standard in number naming.)
© Joan A. Cotter, Ph.D., 2012202
Math Way of Naming Numbers• Only 11 words are needed to count to 100 the math way, 28 in English. (All Indo-European languages are non-standard in number naming.)
• Asian children learn mathematics using the math way of counting.
© Joan A. Cotter, Ph.D., 2012203
Math Way of Naming Numbers• Only 11 words are needed to count to 100 the math way, 28 in English. (All Indo-European languages are non-standard in number naming.)
• Asian children learn mathematics using the math way of counting.
• They understand place value in first grade; only half of U.S. children understand place value at the end of fourth grade.
© Joan A. Cotter, Ph.D., 2012204
Math Way of Naming Numbers• Only 11 words are needed to count to 100 the math way, 28 in English. (All Indo-European languages are non-standard in number naming.)
• Asian children learn mathematics using the math way of counting.
• They understand place value in first grade; only half of U.S. children understand place value at the end of fourth grade.
• Mathematics is the science of patterns. The patterned math way of counting greatly helps children learn number sense.
© Joan A. Cotter, Ph.D., 2012205
Math Way of Naming NumbersCompared to reading:
© Joan A. Cotter, Ph.D., 2012206
Math Way of Naming Numbers
• Just as reciting the alphabet doesn’t teach reading, counting doesn’t teach arithmetic.
Compared to reading:
© Joan A. Cotter, Ph.D., 2012207
Math Way of Naming Numbers
• Just as reciting the alphabet doesn’t teach reading, counting doesn’t teach arithmetic.
• Just as we first teach the sound of the letters, we must first teach the name of the quantity (math way).
Compared to reading:
© Joan A. Cotter, Ph.D., 2012208
Math Way of Naming Numbers
• Just as reciting the alphabet doesn’t teach reading, counting doesn’t teach arithmetic.
• Just as we first teach the sound of the letters, we must first teach the name of the quantity (math way).
• Montessorians do use the math way of naming numbers but are too quick to switch to traditional names. Use the math way for a longer period of time.
Compared to reading:
© Joan A. Cotter, Ph.D., 2012209
Math Way of Naming Numbers
“Rather, the increased gap between Chinese and U.S. students and that of Chinese Americans and Caucasian Americans may be due primarily to the nature of their initial gap prior to formal schooling, such as counting efficiency and base-ten number sense.”
Jian Wang and Emily Lin, 2005Researchers
© Joan A. Cotter, Ph.D., 2012210
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Research task:
© Joan A. Cotter, Ph.D., 2012211
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Then ask the child to subtract 14.
Research task:
© Joan A. Cotter, Ph.D., 2012212
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Then ask the child to subtract 14.
Children thinking of 14 as 14 ones count 14.
Research task:
© Joan A. Cotter, Ph.D., 2012213
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Then ask the child to subtract 14.
Children thinking of 14 as 14 ones counted 14.
Research task:
© Joan A. Cotter, Ph.D., 2012214
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Research task:
Then ask the child to subtract 14.
Children thinking of 14 as 14 ones counted 14.
© Joan A. Cotter, Ph.D., 2012215
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Then ask the child to subtract 14.
Children thinking of 14 as 14 ones counted 14.
Research task:
© Joan A. Cotter, Ph.D., 2012216
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Then ask the child to subtract 14.
Children thinking of 14 as 14 ones counted 14.
Research task:
© Joan A. Cotter, Ph.D., 2012217
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Then ask the child to subtract 14.
Children thinking of 14 as 14 ones counted 14.
Research task:
© Joan A. Cotter, Ph.D., 2012218
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Then ask the child to subtract 14.
Children thinking of 14 as 14 ones counted 14.
Research task:
© Joan A. Cotter, Ph.D., 2012219
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Then ask the child to subtract 14.
Children thinking of 14 as 14 ones counted 14.
Research task:
© Joan A. Cotter, Ph.D., 2012220
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Then ask the child to subtract 14.
Children who understand tens remove a ten and 4 ones.
Research task:
© Joan A. Cotter, Ph.D., 2012221
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Then ask the child to subtract 14.
Children who understand tens remove a ten and 4 ones.
Research task:
© Joan A. Cotter, Ph.D., 2012222
Math Way of Naming Numbers
Using 10s and 1s, ask the child to construct 48.
Then ask the child to subtract 14.
Children who understand tens remove a ten and 4 ones.
Research task:
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
4-ten = forty
The “ty” means tens.
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
4-ten = forty
The “ty” means tens.
The traditional names for 40, 60, 70, 80, and 90 follow a pattern.
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
6-ten = sixty
The “ty” means tens.
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
3-ten = thirty
“Thir” also used in 1/3, 13 and 30.
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
5-ten = fifty
“Fif” also used in 1/5, 15 and 50.
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
2-ten = twenty
Two used to be pronounced “twoo.”
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
A word gamefireplace place-fire
Say the syllables backward. This is how we say the teen numbers.
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
A word gamefireplace place-fire
paper-newsnewspaper
Say the syllables backward. This is how we say the teen numbers.
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
A word gamefireplace place-fire
paper-news
box-mail mailbox
newspaper
Say the syllables backward. This is how we say the teen numbers.
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
ten 4
“Teen” also means ten.
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
ten 4 teen 4
“Teen” also means ten.
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
ten 4 teen 4 fourteen
“Teen” also means ten.
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
a one left
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
a one left a left-one
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
a one left a left-one eleven
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
two left
Two pronounced “twoo.”
© Joan A. Cotter, Ph.D., 2012
Math Way of Naming NumbersTraditional names
two left twelve
Two pronounced “twoo.”
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
3-ten
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
3-ten
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
3-ten
3 0
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
3-ten
3 0
Point to the 3 and say 3.
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
3-ten
3 0
Point to 0 and say 10. The 0 makes 3 a ten.
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
3-ten 7
3 0
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
3-ten 7
3 0
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
3-ten 7
3 07
© Joan A. Cotter, Ph.D., 2012
3 0
Composing Numbers
3-ten 7
7
Place the 7 on top of the 0 of the 30.
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
3-ten 7
Notice the way we say the number, represent the number, and write the number all correspond.
3 07
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
7-ten 6
7 86
Another example.
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
7-ten 6
7 86
Another example.
In the UK, pupils are expected to know the amount remaining: 24, that is 100 – 76.
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
10-ten
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
10-ten
1 0 0
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
10-ten
1 0 0
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
10-ten
1 0 0
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
1 hundred
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
1 hundred
1 0 0
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
1 hundred
1 0 0
Of course, we can also read it as one-hun-dred.
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
1 hundred
1 01 01 0 0
Of course, we can also read it as one-hun-dred.
© Joan A. Cotter, Ph.D., 2012
Composing Numbers
1 hundred
1 0 0
Of course, we can also read it as one-hun-dred.
© Joan A. Cotter, Ph.D., 2012
2584 8
Composing Numbers
To read a number, students are often instructed to start at the right (ones column), contrary to normal reading of numbers and text:
Reading numbers backward
© Joan A. Cotter, Ph.D., 2012262
2584 58
Composing Numbers
To read a number, students are often instructed to start at the right (ones column), contrary to normal reading of numbers and text:
Reading numbers backward
© Joan A. Cotter, Ph.D., 2012263
2584258
Composing Numbers
To read a number, students are often instructed to start at the right (ones column), contrary to normal reading of numbers and text:
Reading numbers backward
© Joan A. Cotter, Ph.D., 2012264
2584258
Composing Numbers
4
To read a number, students are often instructed to start at the right (ones column), contrary to normal reading of numbers and text:
Reading numbers backward
© Joan A. Cotter, Ph.D., 2012265
2584258
Composing Numbers
4
To read a number, students are often instructed to start at the right (ones column), contrary to normal reading of numbers and text:
Reading numbers backward
The Decimal Cards encourage reading numbers in the normal order.
© Joan A. Cotter, Ph.D., 2012266
Composing Numbers
In scientific notation, we “stand” on the left digit and note the number of digits to the right. (That’s why we shouldn’t refer to the 4 as the 4th column.)
Scientific Notation
4000 = 4 x 103
© Joan A. Cotter, Ph.D., 2012267
Fact Strategies
© Joan A. Cotter, Ph.D., 2012268
Fact Strategies
• A strategy is a way to learn a new fact or recall a forgotten fact.
© Joan A. Cotter, Ph.D., 2012269
Fact Strategies
• A strategy is a way to learn a new fact or recall a forgotten fact.
• A visualizable representation is part of a powerful strategy.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesComplete the Ten
9 + 5 =
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesComplete the Ten
9 + 5 =
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesComplete the Ten
9 + 5 =
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesComplete the Ten
9 + 5 =
Take 1 from the 5 and give it to the 9.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesComplete the Ten
9 + 5 =
Take 1 from the 5 and give it to the 9.
Use two hands and move the beads simultaneously.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesComplete the Ten
9 + 5 =
Take 1 from the 5 and give it to the 9.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesComplete the Ten
9 + 5 = 14
Take 1 from the 5 and give it to the 9.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesTwo Fives
8 + 6 =
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesTwo Fives
8 + 6 =
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesTwo Fives
8 + 6 =
Two fives make 10.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesTwo Fives
8 + 6 =
Just add the “leftovers.”
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesTwo Fives
8 + 6 =10 + 4 = 14
Just add the “leftovers.”
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesTwo Fives
7 + 5 =
Another example.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesTwo Fives
7 + 5 =
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesTwo Fives
7 + 5 = 12
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesGoing Down
15 – 9 =
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesDifference
7 – 4 =
Subtract 4 from 5; then add 2.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesGoing Down
15 – 9 =
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesGoing Down
15 – 9 =
Subtract 5;then 4.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesGoing Down
15 – 9 =
Subtract 5;then 4.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesGoing Down
15 – 9 =
Subtract 5;then 4.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesGoing Down
15 – 9 = 6
Subtract 5;then 4.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesSubtract from 10
15 – 9 =
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesSubtract from 10
15 – 9 =
Subtract 9 from 10.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesSubtract from 10
15 – 9 =
Subtract 9 from 10.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesSubtract from 10
15 – 9 =
Subtract 9 from 10.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesSubtract from 10
15 – 9 = 6
Subtract 9 from 10.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesGoing Up
13 – 9 =
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesGoing Up
13 – 9 =
Start with 9; go up to 13.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesGoing Up
13 – 9 =
Start with 9; go up to 13.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesGoing Up
13 – 9 =
Start with 9; go up to 13.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesGoing Up
13 – 9 =
Start with 9; go up to 13.
© Joan A. Cotter, Ph.D., 2012
Fact StrategiesGoing Up
13 – 9 =1 + 3 = 4
Start with 9; go up to 13.
© Joan A. Cotter, Ph.D., 2012
MoneyPenny
© Joan A. Cotter, Ph.D., 2012
MoneyNickel
© Joan A. Cotter, Ph.D., 2012
MoneyDime
© Joan A. Cotter, Ph.D., 2012
MoneyQuarter
© Joan A. Cotter, Ph.D., 2012
MoneyQuarter
© Joan A. Cotter, Ph.D., 2012
MoneyQuarter
© Joan A. Cotter, Ph.D., 2012
MoneyQuarter
© Joan A. Cotter, Ph.D., 2012310
Base-10 Picture Cards
One
© Joan A. Cotter, Ph.D., 2012311
Base-10 Picture Cards
Ten One
© Joan A. Cotter, Ph.D., 2012312
Base-10 Picture Cards
Hundred Ten One
© Joan A. Cotter, Ph.D., 2012313
Base-10 Picture Cards
Thousand Hundred Ten One
© Joan A. Cotter, Ph.D., 2012314
Base-10 Picture Cards
3658+2724
Add using the base-10 picture cards.
© Joan A. Cotter, Ph.D., 2012315
Base-10 Picture Cards
3 0 0 06 0 05 08
© Joan A. Cotter, Ph.D., 2012316
Base-10 Picture Cards
3 0 0 06 0 05 08
© Joan A. Cotter, Ph.D., 2012317
Base-10 Picture Cards
3 0 0 06 0 05 08
© Joan A. Cotter, Ph.D., 2012318
Base-10 Picture Cards
3 0 0 06 0 05 08
© Joan A. Cotter, Ph.D., 2012319
Base-10 Picture Cards
2 0 0 07 0 02 04
© Joan A. Cotter, Ph.D., 2012320
Base-10 Picture Cards
2 0 0 07 0 02 04
© Joan A. Cotter, Ph.D., 2012321
Base-10 Picture Cards
3 0 0 06 0 05 082 0 0 07 0 02 04
Add them together.
© Joan A. Cotter, Ph.D., 2012322
Base-10 Picture Cards
3 0 0 06 0 05 082 0 0 07 0 02 04
© Joan A. Cotter, Ph.D., 2012323
Base-10 Picture Cards
3 0 0 06 0 05 082 0 0 07 0 02 04
Trade 10 ones for 1 ten.
© Joan A. Cotter, Ph.D., 2012324
Base-10 Picture Cards
Trade 10 ones for 1 ten.
3 0 0 06 0 05 082 0 0 07 0 02 04
© Joan A. Cotter, Ph.D., 2012325
Base-10 Picture Cards
Trade 10 ones for 1 ten.
3 0 0 06 0 05 082 0 0 07 0 02 04
© Joan A. Cotter, Ph.D., 2012326
Base-10 Picture Cards
3 0 0 06 0 05 082 0 0 07 0 02 04
© Joan A. Cotter, Ph.D., 2012327
Base-10 Picture Cards
3 0 0 06 0 05 082 0 0 07 0 02 04
Trade 10 hundreds for 1 thousand.
© Joan A. Cotter, Ph.D., 2012328
Base-10 Picture Cards
Trade 10 hundreds for 1 thousand.
3 0 0 06 0 05 082 0 0 07 0 02 04
© Joan A. Cotter, Ph.D., 2012329
Base-10 Picture Cards
Trade 10 hundreds for 1 thousand.
3 0 0 06 0 05 082 0 0 07 0 02 04
© Joan A. Cotter, Ph.D., 2012330
Base-10 Picture Cards
Trade 10 hundreds for 1 thousand.
3 0 0 06 0 05 082 0 0 07 0 02 04
© Joan A. Cotter, Ph.D., 2012331
Base-10 Picture Cards
6 0 0 03 0 08 02
3 0 0 06 0 05 082 0 0 07 0 02 04
© Joan A. Cotter, Ph.D., 2012332
Bead Frame
1
10
100
1000
© Joan A. Cotter, Ph.D., 2012333
Bead Frame
8+ 6
1
10
100
1000
© Joan A. Cotter, Ph.D., 2012334
Bead Frame
8+ 6
1
10
100
1000
© Joan A. Cotter, Ph.D., 2012335
Bead Frame
8+ 6
1
10
100
1000
© Joan A. Cotter, Ph.D., 2012336
Bead Frame
8+ 6
1
10
100
1000
© Joan A. Cotter, Ph.D., 2012337
Bead Frame
8+ 6
1
10
100
1000
© Joan A. Cotter, Ph.D., 2012338
Bead Frame
8+ 6
1
10
100
1000
© Joan A. Cotter, Ph.D., 2012339
Bead Frame
8+ 6
1
10
100
1000
© Joan A. Cotter, Ph.D., 2012340
Bead Frame
8+ 6
1
10
100
1000
© Joan A. Cotter, Ph.D., 2012341
Bead Frame
8+ 6
1
10
100
1000
© Joan A. Cotter, Ph.D., 2012342
8+ 614
1
10
100
1000
Bead Frame
© Joan A. Cotter, Ph.D., 2012343
Bead FrameDifficulties for the child
© Joan A. Cotter, Ph.D., 2012344
• Distracting: Room is visible through the frame.
Bead FrameDifficulties for the child
© Joan A. Cotter, Ph.D., 2012345
• Distracting: Room is visible through the frame.
• Not visualizable: Beads need to be grouped in fives.
Bead FrameDifficulties for the child
© Joan A. Cotter, Ph.D., 2012346
• Distracting: Room is visible through the frame.
• Not visualizable: Beads need to be grouped in fives.
• Inconsistent with equation order when beads are moved right: Beads need to be moved left.
Bead FrameDifficulties for the child
© Joan A. Cotter, Ph.D., 2012347
• Distracting: Room is visible through the frame.
• Not visualizable: Beads need to be grouped in fives.
• Inconsistent with equation order when beads are moved right: Beads need to be moved left.
• Hierarchies of numbers represented sideways: They need to be in vertical columns.
Bead FrameDifficulties for the child
© Joan A. Cotter, Ph.D., 2012348
• Distracting: Room is visible through the frame.
• Not visualizable: Beads need to be grouped in fives.
• Inconsistent with equation order when beads are moved right: Beads need to be moved left.
• Hierarchies of numbers represented sideways: They need to be in vertical columns.
• Trading done before second number is completely added: Addends need to combined before trading.
Bead FrameDifficulties for the child
© Joan A. Cotter, Ph.D., 2012349
• Distracting: Room is visible through the frame.
• Not visualizable: Beads need to be grouped in fives.
• Inconsistent with equation order when beads are moved right: Beads need to be moved left.
• Hierarchies of numbers represented sideways: They need to be in vertical columns.
• Trading done before second number is completely added: Addends need to combined before trading.
• Answer is read going up: We read top to bottom.
Bead FrameDifficulties for the child
© Joan A. Cotter, Ph.D., 2012
Trading SideCleared
1000 10 1100
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideThousands
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideHundreds
The third wire from each end is not used.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideTens
The third wire from each end is not used.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideOnes
The third wire from each end is not used.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding
8+ 6
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding
8+ 6
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding
8+ 6
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding
8+ 6
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding
8+ 614
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding
8+ 614
Too many ones; trade 10 ones for 1 ten.
You can see the 10 ones (yellow).
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding
8+ 614
Too many ones; trade 10 ones for 1 ten.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding
8+ 614
Too many ones; trade 10 ones for 1 ten.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding
8+ 614
Same answer before and after trading.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideCleared
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
Object: To get a high score by adding numbers on the green cards.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
Object: To get a high score by adding numbers on the green cards.
7
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
Object: To get a high score by adding numbers on the green cards.
7
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
Turn over another card. Enter 6 beads. Do we need to trade?
6
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
Turn over another card. Enter 6 beads. Do we need to trade?
6
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
Turn over another card. Enter 6 beads. Do we need to trade?
6
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
Trade 10 ones for 1 ten.
6
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
6
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
6
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
9
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
9
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
Another trade.
9
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
Another trade.
9
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
3
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideBead Trading game
3
© Joan A. Cotter, Ph.D., 2012
Trading SideBead Trading game
• In the Bead Trading game 10 ones for 1 ten occurs frequently;
© Joan A. Cotter, Ph.D., 2012
Trading SideBead Trading game
• In the Bead Trading game 10 ones for 1 ten occurs frequently;10 tens for 1 hundred, less often;
© Joan A. Cotter, Ph.D., 2012
Trading SideBead Trading game
• In the Bead Trading game 10 ones for 1 ten occurs frequently;10 tens for 1 hundred, less often;10 hundreds for 1 thousand, rarely.
© Joan A. Cotter, Ph.D., 2012
Trading SideBead Trading game
• In the Bead Trading game 10 ones for 1 ten occurs frequently;10 tens for 1 hundred, less often;10 hundreds for 1 thousand, rarely.
• Bead trading helps the child experience the greater value of each column from left to right.
© Joan A. Cotter, Ph.D., 2012
Trading SideBead Trading game
• In the Bead Trading game 10 ones for 1 ten occurs frequently;10 tens for 1 hundred, less often;10 hundreds for 1 thousand, rarely.
• Bead trading helps the child experience the greater value of each column from left to right.
• To detect a pattern, there must be at least three examples in the sequence. (Place value is a pattern.)
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
Enter the first number from left to right.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
Enter the first number from left to right.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
Enter the first number from left to right.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
Enter the first number from left to right.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
Enter the first number from left to right.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
Enter the first number from left to right.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
Add starting at the right. Write results after each step.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
Add starting at the right. Write results after each step.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
Add starting at the right. Write results after each step.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
Add starting at the right. Write results after each step.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
6
Add starting at the right. Write results after each step.
. . . 6 ones. Did anything else happen?
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
6
Add starting at the right. Write results after each step.
1
Is it okay to show the extra ten by writing a 1 above the tens column?
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
6
Add starting at the right. Write results after each step.
1
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
6
Add starting at the right. Write results after each step.
1
Do we need to trade? [no]
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
96
Add starting at the right. Write results after each step.
1
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
96
Add starting at the right. Write results after each step.
1
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
96
Add starting at the right. Write results after each step.
1
Do we need to trade? [yes]
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
96
Add starting at the right. Write results after each step.
1
Notice the number of yellow beads. [3] Notice the number of blue beads left. [3] Coincidence? No, because 13 – 10 = 3.
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
96
Add starting at the right. Write results after each step.
1
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
396
Add starting at the right. Write results after each step.
1
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
396
Add starting at the right. Write results after each step.
11
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
396
Add starting at the right. Write results after each step.
11
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
396
Add starting at the right. Write results after each step.
11
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
6396
Add starting at the right. Write results after each step.
11
© Joan A. Cotter, Ph.D., 2012
1000 10 1100
Trading SideAdding 4-digit numbers
3658+ 2738
6396
Add starting at the right. Write results after each step.
11
© Joan A. Cotter, Ph.D., 2012
The Stamp Game
100 10 1100 10 1
100 10 1100 10 1
10 1 1
1000 100 10 11000 100 10 1
1000 100 10 11000 100 10 1
10
10
100 100
100 100
100 100
100 100
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
6 4 =(6 taken 4 times)
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
6 4 =(6 taken 4 times)
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
6 4 =(6 taken 4 times)
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
6 4 =(6 taken 4 times)
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
6 4 =(6 taken 4 times)
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
9 3 =
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
9 3 =
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
9 3 =30
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
9 3 =30 – 3 = 27
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
4 8 =
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
4 8 =
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
4 8 =
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
4 8 =20 + 12 = 32
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
7 7 =
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
7 7 =
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusBasic facts
7 7 =25 + 10 + 10 + 4 = 49
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusCommutative property
5 6 =
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusCommutative property
5 6 =
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusCommutative property
5 6 =
© Joan A. Cotter, Ph.D., 2012
Multiplication on the AL AbacusCommutative property
5 6 = 6 5
© Joan A. Cotter, Ph.D., 2012432
7 8 =
This method was used in the Middle Ages, rather than memorize the facts > 5 5.
Multiplication on the AL AbacusFor facts > 5 5
© Joan A. Cotter, Ph.D., 2012433
7 8 =
This method was used in the Middle Ages, rather than memorize the facts > 5 5.
Multiplication on the AL AbacusFor facts > 5 5
© Joan A. Cotter, Ph.D., 2012434
7 8 =
This method was used in the Middle Ages, rather than memorize the facts > 5 5.
Multiplication on the AL AbacusFor facts > 5 5
Tens:
© Joan A. Cotter, Ph.D., 2012435
7 8 =
This method was used in the Middle Ages, rather than memorize the facts > 5 5.
Multiplication on the AL AbacusFor facts > 5 5
Tens:
© Joan A. Cotter, Ph.D., 2012436
7 8 =50 + 6
This method was used in the Middle Ages, rather than memorize the facts > 5 5.
Multiplication on the AL AbacusFor facts > 5 5
Tens: Ones: 3 26
20+ 30
50
© Joan A. Cotter, Ph.D., 2012437
7 8 =50 + 6 = 56
This method was used in the Middle Ages, rather than memorize the facts > 5 5.
Multiplication on the AL AbacusFor facts > 5 5
Tens: Ones: 3 26
20+ 30
50
© Joan A. Cotter, Ph.D., 2012438
9 7 =
Multiplication on the AL AbacusFor facts > 5 5
© Joan A. Cotter, Ph.D., 2012439
9 7 =
Multiplication on the AL AbacusFor facts > 5 5
© Joan A. Cotter, Ph.D., 2012440
9 7 =
Multiplication on the AL AbacusFor facts > 5 5
Tens:
© Joan A. Cotter, Ph.D., 2012441
9 7 =
Multiplication on the AL AbacusFor facts > 5 5
Tens:
© Joan A. Cotter, Ph.D., 2012442
9 7 =
Multiplication on the AL AbacusFor facts > 5 5
Tens: 40+ 20
© Joan A. Cotter, Ph.D., 2012443
9 7 =60 +
Multiplication on the AL AbacusFor facts > 5 5
Tens: 40+ 20
60
© Joan A. Cotter, Ph.D., 2012444
9 7 =60 +
Multiplication on the AL AbacusFor facts > 5 5
Tens: Ones:40+ 20
60
© Joan A. Cotter, Ph.D., 2012445
9 7 =60 +
Multiplication on the AL AbacusFor facts > 5 5
Tens: Ones:40+ 20
60
© Joan A. Cotter, Ph.D., 2012446
9 7 =60 +
Multiplication on the AL AbacusFor facts > 5 5
Tens: Ones: 1 3
40+ 20
60
© Joan A. Cotter, Ph.D., 2012447
9 7 =60 + 3
Multiplication on the AL AbacusFor facts > 5 5
Tens: Ones:40+ 20
60
1 3
3
© Joan A. Cotter, Ph.D., 2012448
9 7 =60 + 3 = 63
Multiplication on the AL AbacusFor facts > 5 5
Tens: Ones: 1 3
3
40+ 20
60
© Joan A. Cotter, Ph.D., 2012449
The Multiplication Board1 2 3 4 5 6 7 8 9 10
6
6 4
6 x 4 on original multiplication board.
© Joan A. Cotter, Ph.D., 2012450
1 2 3 4 5 6 7 8 9 10
6
The Multiplication Board
6 4
Using two colors.
© Joan A. Cotter, Ph.D., 2012451
The Multiplication Board1 2 3 4 5 6 7 8 9 10
7
7 7
7 x 7 on original multiplication board.
© Joan A. Cotter, Ph.D., 2012452
1 2 3 4 5 6 7 8 9 10
7
The Multiplication Board
7 7
Upper left square is 25, yellow rectangles are 10. So, 25, 35, 45, 49.
© Joan A. Cotter, Ph.D., 2012453
The Multiplication Board
7 7
Less clutter.
© Joan A. Cotter, Ph.D., 2012454
Multiples PatternsTwos
2 4 6 8 10
12 14 16 18 20
Recognizing multiples needed for fractions and algebra.
© Joan A. Cotter, Ph.D., 2012455
Multiples PatternsTwos
2 4 6 8 10
12 14 16 18 20
The ones repeat in the second row.
Recognizing multiples needed for fractions and algebra.
© Joan A. Cotter, Ph.D., 2012456
Multiples PatternsFours
4 8 12 16 20
24 28 32 36 40
The ones repeat in the second row.
© Joan A. Cotter, Ph.D., 2012457
Multiples PatternsSixes and Eights
6 12 18 24 30
36 42 48 54 60
8 16 24 32 40
48 56 64 72 80
© Joan A. Cotter, Ph.D., 2012458
Multiples PatternsSixes and Eights
6 12 18 24 30
36 42 48 54 60
8 16 24 32 40
48 56 64 72 80
© Joan A. Cotter, Ph.D., 2012459
Multiples PatternsSixes and Eights
6 12 18 24 30
36 42 48 54 60
8 16 24 32 40
48 56 64 72 80
Again the ones repeat in the second row.
© Joan A. Cotter, Ph.D., 2012460
Multiples PatternsSixes and Eights
6 12 18 24 30
36 42 48 54 60
8 16 24 32 40
48 56 64 72 80
The ones in the 8s show the multiples of 2.
© Joan A. Cotter, Ph.D., 2012461
Multiples PatternsSixes and Eights
6 12 18 24 30
36 42 48 54 60
8 16 24 32 40
48 56 64 72 80
The ones in the 8s show the multiples of 2.
© Joan A. Cotter, Ph.D., 2012462
Multiples PatternsSixes and Eights
6 12 18 24 30
36 42 48 54 60
8 16 24 32 40
48 56 64 72 80
The ones in the 8s show the multiples of 2.
© Joan A. Cotter, Ph.D., 2012463
Multiples PatternsSixes and Eights
6 12 18 24 30
36 42 48 54 60
8 16 24 32 40
48 56 64 72 80
The ones in the 8s show the multiples of 2.
© Joan A. Cotter, Ph.D., 2012464
Multiples PatternsSixes and Eights
6 12 18 24 30
36 42 48 54 60
8 16 24 32 40
48 56 64 72 80
The ones in the 8s show the multiples of 2.
© Joan A. Cotter, Ph.D., 2012465
Multiples PatternsSixes and Eights
6 12 18 24 30
36 42 48 54 60
8 16 24 32 40
48 56 64 72 80
6 4
6 4 is the fourth number (multiple).
© Joan A. Cotter, Ph.D., 2012466
Multiples PatternsSixes and Eights
6 12 18 24 30
36 42 48 54 60
8 16 24 32 40
48 56 64 72 80 8 7
8 7 is the seventh number (multiple).
© Joan A. Cotter, Ph.D., 2012467
Multiples PatternsNines
9 18 27 36 45
90 81 72 63 54
The second row is written in reverse order.Also the digits in each number add to 9.
© Joan A. Cotter, Ph.D., 2012468
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Observe the ones.
© Joan A. Cotter, Ph.D., 2012469
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Observe the ones.
© Joan A. Cotter, Ph.D., 2012470
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Observe the ones.
© Joan A. Cotter, Ph.D., 2012471
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Observe the ones.
© Joan A. Cotter, Ph.D., 2012472
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Observe the ones.
© Joan A. Cotter, Ph.D., 2012473
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Observe the ones.
© Joan A. Cotter, Ph.D., 2012474
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Observe the ones.
© Joan A. Cotter, Ph.D., 2012475
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Observe the ones.
© Joan A. Cotter, Ph.D., 2012476
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Observe the ones.
© Joan A. Cotter, Ph.D., 2012477
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Observe the ones.
© Joan A. Cotter, Ph.D., 2012478
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Observe the ones.
© Joan A. Cotter, Ph.D., 2012479
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: The tens are the same in each row.
© Joan A. Cotter, Ph.D., 2012480
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Add the digits in the columns.
© Joan A. Cotter, Ph.D., 2012481
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Add the digits in the columns.
© Joan A. Cotter, Ph.D., 2012482
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Add the digits in the columns.
© Joan A. Cotter, Ph.D., 2012483
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Add the “opposites.”
© Joan A. Cotter, Ph.D., 2012484
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Add the “opposites.”
© Joan A. Cotter, Ph.D., 2012485
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Add the “opposites.”
© Joan A. Cotter, Ph.D., 2012486
Multiples PatternsThrees
3 6 9
12 15 18
21 24 27
30
The 3s have several patterns: Add the “opposites.”
© Joan A. Cotter, Ph.D., 2012487
Multiples PatternsSevens
7 14 21
28 35 42
49 56 63
70
The 7s have the 1, 2, 3… pattern.
© Joan A. Cotter, Ph.D., 2012488
Multiples PatternsSevens
7 14 21
28 35 42
49 56 63
70
The 7s have the 1, 2, 3… pattern.
© Joan A. Cotter, Ph.D., 2012489
Multiples PatternsSevens
7 14 21
28 35 42
49 56 63
70
The 7s have the 1, 2, 3… pattern.
© Joan A. Cotter, Ph.D., 2012490
Multiples PatternsSevens
7 14 21
28 35 42
49 56 63
70
The 7s have the 1, 2, 3… pattern.
© Joan A. Cotter, Ph.D., 2012491
Multiples PatternsSevens
7 14 21
28 35 42
49 56 63
70
Look at the tens.
© Joan A. Cotter, Ph.D., 2012492
Multiples PatternsSevens
7 14 21
28 35 42
49 56 63
70
Look at the tens.
© Joan A. Cotter, Ph.D., 2012493
Multiples PatternsSevens
7 14 21
28 35 42
49 56 63
70
Look at the tens.
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
“Multiples” are sometimes referred to as “skip counting.”
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
Aim: To help the players learn the multiples patterns.
“Multiples” are sometimes referred to as “skip counting.”
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
Object of the game: To be the first player to collect all ten cards of a multiple in order.
Aim: To help the players learn the multiples patterns.
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
The 7s envelope contains 10 cards, each with one of the numbers listed.
7 14 2128 35 4249 56 63
70
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
The 8s envelope contains 10 cards, each with one of the numbers listed.
8 16 24 32 4048 56 64 72 80
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
8 16 24 32 4048 56 64 72 80
Players may refer to their envelopes at all times.
8 16 24 32 4048 56 64 72 80
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
8 16 24 32 4048 56 64 72 80
Players may refer to their envelopes at all times.
8 16 24 32 4048 56 64 72 80
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
Players may refer to their envelopes at all times.
8 16 24 32 4048 56 64 72 80
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
14
8 16 24 32 4048 56 64 72 80
7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
The 7s player is looking for a 7.
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
Wrong card, so it is turned face down in its original space.
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
7 14 2128 35 4249 56 6370
8 16 24 32 4048 56 64 72 80
The 8s player takes a turn.
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
40
8 16 24 32 4048 56 64 72 80
7 14 2128 35 4249 56 6370
8 16 24 32 4048 56 64 72 80
Cannot use this card yet.
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
7 14 2128 35 4249 56 6370
8 16 24 32 4048 56 64 72 80
Card returned.
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8
8 16 24 32 4048 56 64 72 80
7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
7 14 2128 35 4249 56 6370
8 16 24 32 4048 56 64 72 80
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8
8 16 24 32 4048 56 64 72 80
7 14 2128 35 4249 56 6370
8 16 24 32 4048 56 64 72 80
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
88
7 14 2128 35 4249 56 6370
8 16 24 32 4048 56 64 72 80
The needed card is collected. Receives another turn.
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
8856
7 14 2128 35 4249 56 6370
8 16 24 32 4048 56 64 72 80
Who needs 56? [both 7s and 8s] At least one card per game is a duplicate.
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
88
7 14 2128 35 4249 56 6370
8 16 24 32 4048 56 64 72 80
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
88
7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
88
7 7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
The needed card.
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
88
7
7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
Where is that 14?
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
88
7
14
7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
88
7 14
7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
© Joan A. Cotter, Ph.D., 2012
Multiples Memory
8 16 24 32 4048 56 64 72 80
88
7 14
24 7 14 2128 35 4249 56 6370
7 14 2128 35 4249 56 6370
A another turn.
© Joan A. Cotter, Ph.D., 2012
7 14 2128 35 4249 56 6370
Multiples Memory
8 16 24 32 4048 56 64 72 80
88
7 14
7 14 2128 35 4249 56 6370
8 16 24 32 4048 56 64 72 80
We’ll never know who won.
© Joan A. Cotter, Ph.D., 2012
7 14 2128 35 4249 56 6370
Multiples Memory
8 16 24 32 4048 56 64 72 80
8 16 24 32 4048 56 64 72 80
7 14 2128 35 4249 56 6370
We’ll never know who won.
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
A rectangle 3 6
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
A rectangle 3 6
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
A rectangle 3 6
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
A rectangle 3 6
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
A rectangle 3 6
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
4 7
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
4 7Grouping in fives makes counting over unnecessary.
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
Removing duplicates.
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
9 3
Removing duplicates.
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
9 3
Removing duplicates.
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
6 6
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
6 6
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
4 7
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
4 7
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
4 7
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
7 9
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
7 9
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
7 9
9 7
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
7 9
9 7
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
squares
© Joan A. Cotter, Ph.D., 2012
Multiplication Tables
squares
© Joan A. Cotter, Ph.D., 2012
Fraction Chart1
12
12
13
14
15
16
17
18
19
110
13
13
14
15
16
17
18
19
14
15
16
17
18
14
15
16171819
15
16
16
17
17
17
18
18
18
18
19
19
19
19
19
19
110
110
110
110
110
110
110
110
110
Giving the student the big picture.
© Joan A. Cotter, Ph.D., 2012
Fraction Chart1
12
12
13
14
15
16
17
18
19
110
13
13
14
15
16
17
18
19
14
15
16
17
18
14
15
16171819
15
16
16
17
17
17
18
18
18
18
19
19
19
19
19
19
110
110
110
110
110
110
110
110
110
How many fourths in a whole? Giving the child the big picture, a Montessori principle.
© Joan A. Cotter, Ph.D., 2012
Fraction Chart1
12
12
13
14
15
16
17
18
19
110
13
13
14
15
16
17
18
19
14
15
16
17
18
14
15
16171819
15
16
16
17
17
17
18
18
18
18
19
19
19
19
19
19
110
110
110
110
110
110
110
110
110
How many fourths in a whole? Giving the child the big picture, a Montessori principle.
© Joan A. Cotter, Ph.D., 2012
Fraction Chart1
12
12
13
14
15
16
17
18
19
110
13
13
14
15
16
17
18
19
14
15
16
17
18
14
15
16171819
15
16
16
17
17
17
18
18
18
18
19
19
19
19
19
19
110
110
110
110
110
110
110
110
110
How many fourths in a whole? Giving the child the big picture, a Montessori principle.
© Joan A. Cotter, Ph.D., 2012
Fraction Chart1
12
12
13
14
15
16
17
18
19
110
13
13
14
15
16
17
18
19
14
15
16
17
18
14
15
16171819
15
16
16
17
17
17
18
18
18
18
19
19
19
19
19
19
110
110
110
110
110
110
110
110
110
How many fourths in a whole? Giving the child the big picture, a Montessori principle.
© Joan A. Cotter, Ph.D., 2012
Fraction Chart1
12
12
13
14
15
16
17
18
19
110
13
13
14
15
16
17
18
19
14
15
16
17
18
14
15
16171819
15
16
16
17
17
17
18
18
18
18
19
19
19
19
19
19
110
110
110
110
110
110
110
110
110
How many fourths in a whole? Giving the child the big picture, a Montessori principle.
© Joan A. Cotter, Ph.D., 2012
Fraction Chart1
12
12
13
14
15
16
17
18
19
110
13
13
14
15
16
17
18
19
14
15
16
17
18
14
15
16171819
15
16
16
17
17
17
18
18
18
18
19
19
19
19
19
19
110
110
110
110
110
110
110
110
110
How many eighths in a whole? Giving the student the big picture.
© Joan A. Cotter, Ph.D., 2012
Fraction Chart1
12
12
13
14
15
16
17
18
19
110
13
13
14
15
16
17
18
19
14
15
16
17
18
14
15
16171819
15
16
16
17
17
17
18
18
18
18
19
19
19
19
19
19
110
110
110
110
110
110
110
110
110
Which is more, 3/4 or 4/5?
© Joan A. Cotter, Ph.D., 2012
Fraction Chart1
12
12
13
14
15
16
17
18
19
110
13
13
14
15
16
17
18
19
14
15
16
17
18
14
15
16171819
15
16
16
17
17
17
18
18
18
18
19
19
19
19
19
19
110
110
110
110
110
110
110
110
110
Which is more, 3/4 or 4/5?
© Joan A. Cotter, Ph.D., 2012
Fraction Chart1
12
12
13
14
15
16
17
18
19
110
13
13
14
15
16
17
18
19
14
15
16
17
18
14
15
16171819
15
16
16
17
17
17
18
18
18
18
19
19
19
19
19
19
110
110
110
110
110
110
110
110
110
Which is more, 3/4 or 4/5? Giving the child the big picture.
© Joan A. Cotter, Ph.D., 2012
Fraction Chart1
12
12
13
14
15
16
17
18
19
110
13
13
14
15
16
17
18
19
14
15
16
17
18
14
15
16171819
15
16
16
17
17
17
18
18
18
18
19
19
19
19
19
19
110
110
110
110
110
110
110
110
110
Which is more, 3/4 or 4/5? Giving the child the big picture.
© Joan A. Cotter, Ph.D., 2012
Fraction Chart
1
12
13
14
15
17
18
110
16
19
Stairs (Unit fractions)
© Joan A. Cotter, Ph.D., 2012
Fraction Chart
1
12
13
14
15
17
18
110
16
19
A hyperbola.
Stairs (Unit fractions)
© Joan A. Cotter, Ph.D., 2012
112
12
13
14
15
16
17
18
19
110
13
13
14
15
16
17
18
19
14
15
16
17
18
14
15
16171819
15
16
16
17
17
17
18
18
18
18
19
19
19
19
19
19
110
110
110
110
110
110
110
110
110
Fraction Chart
18
9/8 is 1 and 1/8.
© Joan A. Cotter, Ph.D., 2012
Circle Model
Are we comparing angles, arcs, or area?
© Joan A. Cotter, Ph.D., 2012
Circle Model
61
61
61
61
61
61
51
41
21 3
1
51
51
51
51
41
41
41
31
31
21
Try to compare 4/5 and 5/6 with this model.
© Joan A. Cotter, Ph.D., 2012
Circle Model
Experts in visual literacy say that comparing quantities in pie charts is difficult because most people think linearly. It is easier to compare along a straight line than compare pie slices. askoxford.com
© Joan A. Cotter, Ph.D., 2012
Circle Model
Experts in visual literacy say that comparing quantities in pie charts is difficult because most people think linearly. It is easier to compare along a straight line than compare pie slices. askoxford.com
Specialists also suggest refraining from using more than one pie chart for comparison.
www.statcan.ca
© Joan A. Cotter, Ph.D., 2012564
Circle ModelDifficulties
© Joan A. Cotter, Ph.D., 2012565
• Perpetuates cultural myth fractions are < 1.
Circle ModelDifficulties
© Joan A. Cotter, Ph.D., 2012566
• Perpetuates cultural myth fractions are < 1.
• Does not give the child the “big picture.”
Circle ModelDifficulties
© Joan A. Cotter, Ph.D., 2012567
• Perpetuates cultural myth fractions are < 1.
• Does not give the child the “big picture.” • Limits understanding of fractions: they are
more than “a part of a whole or part of a set.”
Circle ModelDifficulties
© Joan A. Cotter, Ph.D., 2012568
• Perpetuates cultural myth fractions are < 1.
• Does not give the child the “big picture.” • Limits understanding of fractions: they are
more than “a part of a whole or part of a set.”• Makes it difficult for the child to see how
fractions relate to each other.
Circle ModelDifficulties
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
The fraction 4/8 can be reduced on the multiplication table as 1/2.
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
The fraction 4/8 can be reduced on the multiplication table as 1/2.
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
21212828
In what column would you put 21/28?
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
21212828
In what column would you put 21/28?
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
21212828
In what column would you put 21/28?
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
2121282845457272
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
2121282845457272
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
2121282845457272
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
12 12 1616
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
12 12 1616
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
12 12 1616
6/8 needs further simplifying.
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
12 12 1616
6/8 needs further simplifying.
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
12 12 1616
6/8 needs further simplifying.
© Joan A. Cotter, Ph.D., 2012
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 36
10203040
6 12 18 24 30 36 42 48 54 607 14 21 28 35 42 49 56 63 708 16 24 32 40 48 56 64 72 809 18 27 36 45 54 63 72 81 90
10 20 30 40 50 60 70 80 90 1
5 10 15 20 25 30 35 40 45 50
00
Simplifying Fractions
12 12 1616
12/16 could have put here originally.
© Joan A. Cotter, Ph.D., 2012585
NJMAC ConferenceMarch 2, 2012
Edison, New Jersey
by Joan A. Cotter, [email protected]
Enriching Montessori Mathematics with Visualization
7 x 71000
101
100 53
52
Presentations available: rightstartmath.com