Taking the Fear Out of Fractions - RightStart™...

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© Activities for Learning, Inc. 2017

Taking the Fear Out of Fractions

presented by Kathleen Cotter Lawler based on the work of Dr. Joan A. Cotter

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count the blue fish

count all the fish

What fraction of the fish are blue?

Fraction Model: “Fish Tank”

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Fraction Model: “Words”

This is fourths. This is thirds.

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Fraction Models: Circles

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Try to compare 4/5 and 5/6 with this model.

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Fraction Models: Circles

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. www.askoxford.com

Specialists also suggest refraining from using more than one pie chart for comparison.

www.statcan.ca

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Problems Teaching Fractions

•  Common meaning is “small amount.”•  Introduced as part of a whole (not whole story).•  Fraction names use ordinal words.•  Are “improper” fractions somehow

undesirable?•  Mixed numbers different in arithmetic, algebra.•  Our culture implies fractions are difficult.•  Many adults have only a partial understanding.

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Fraction Model: Linear Chart

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Fraction Model: “Color”

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Fraction Model: “Missing Parts” 1

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Fraction Chart

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Ask the children to put it together like a puzzle.

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Fraction Chart

An interesting pattern.

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Fraction Stairs

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Fraction Stairs

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A hyperbola.

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Fraction Stairs

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Two hyperbolas.

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What about ?

Definition of a Fraction

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A fraction is part of a set or part of a whole.Textbook definition

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Definition of a Fraction

A number in the form where b ≠ 0.Mathematical Definition

ab

An expression that indicates the quotient of two quantities.

American Heritage Dictionary

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Fraction Naming

•  Until now, 1 was considered the smallest unit.

•  Fraction – to fracture, to break, to divide.•  Today, we will fracture 1, although always

into equal pieces.

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Fraction Naming

1 One wholedivided into

3 three equal parts

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Fraction Naming

1 Onedivided bythree3

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Fraction Naming 1

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In English, we use ordinal numbers to name fractions, with the exception of half.

1Read as “one-third.”

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= Books Reading

Games provide interesting repetition needed for automaticity.

Games also provide an application for new information.

Games Math

Games

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Unit Fraction War

Purpose: Practice for naming and comparing unit fractions.

To help the children realize a unit fraction decreases as the denominator increases.

Goal: To collect all, or most, of the cards by comparing unit fractions.

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Unit Fraction War

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Fraction Chart

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How many fourths in a whole?

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Fraction Chart

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How many sixths?How many fourths in a whole?

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Purpose: To help the children realize that 5 fifths, 8 eighths, and so forth, make a whole.

Goal: To find the pairs that make a whole.

Concentrating on One Game

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Concentrating on One

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More Fraction Naming

Read as “two-thirds.”

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1Two is3

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s

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More Fraction Naming

1 Onedivided by

3 three

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More Fraction Naming 1 1

2 Twodivided into

3 three equal parts

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More Fraction Naming 1

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1two

3s=

2 Twodivided by

3 three

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Fraction Chart

Which is more, 3/4 or 4/5?

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Fraction Chart

Which is more, 7/8 or 8/9?

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Fraction Circles

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Which is more, 4/5 or 5/6? Which model is easier?

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Partial Chart

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Partial Chart

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Partial Chart

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Fraction War

Purpose: To practice comparing ones, halves, fourths, and eighths in preparation for reading a ruler.

Goal: To capture all the cards.

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Fraction War 1

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Advanced Fraction War

*

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Equivalent Fractions

How many fourths equal a half?

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Equivalent Fractions

How many fourths equal a half? Eighths?

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Equivalent Fractions

How many fourths equal a half? Eighths?

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Equivalent Fractions

How many fourths equal a half? Eighths? Sevenths?

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Fractions Greater Than 1

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Mixed to Improper Fractions Each row of connected rectangles represents 1.

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Mixed to Improper Fractions Each row of connected rectangles represents 1.

Write each quantity as a mixed number and as an improper fraction.

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Mixed to Improper Fractions Each row of connected rectangles represents 1.

Write each quantity as a mixed number and as an improper fraction.

3 4 2 = 11

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Mixed to Improper Fractions Each row of connected rectangles represents 1.

Write each quantity as a mixed number and as an improper fraction.

3 4 2 = 11

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two 4s + 3 = 11

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Mixed to Improper Fractions Each row of connected rectangles represents 1.

Write each quantity as a mixed number and as an improper fraction.

3 4 2 = 11

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two 4s + 3 = 11 1 3 4 = 13

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Mixed to Improper Fractions Each row of connected rectangles represents 1.

Write each quantity as a mixed number and as an improper fraction.

3 4 2 = 11

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two 4s + 3 = 11 1 3 4 = 13

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four 3s + 1 = 13

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Mixed to Improper Fractions Each row of connected rectangles represents 1.

Write each quantity as a mixed number and as an improper fraction.

3 4 2 = 11

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two 4s + 3 = 11 1 3 4 = 13

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four 3s + 1 = 13

3 5 3 = 18

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three 5s + 3 = 18

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Help the student discover the algorithm.

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Improper to Mixed Fractions Write each quantity as an improper fraction, then circle the wholes and write again as a mixed number.

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Improper to Mixed Fractions

11 5 = 2 1

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Write each quantity as an improper fraction, then circle the wholes and write again as a mixed number.

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Improper to Mixed Fractions

= 1 2 3

11 5 = 2 1

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Write each quantity as an improper fraction, then circle the wholes and write again as a mixed number.

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Remember, let the student discover the algorithm.

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Simplifying Fractions

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Simplifying Fractions

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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

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Simplifying Fractions

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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

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Simplifying Fractions

© Activities for Learning, Inc. 2017

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

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Simplifying Fractions

21 28

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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

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Simplifying Fractions

45 72

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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

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Simplifying Fractions

Why does this work?

45 72

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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

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Simplifying Fractions

12 16

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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

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Simplifying Fractions

12 16

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Simplifying Fractions

12 16

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Simplifying Fractions

12 16 4

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Simplifying Fractions

12 16 = 3

4 4

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Let’s look at adding fractions….

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Fraction Chart

What is + ?

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© Activities for Learning, Inc. 2017

Fraction Chart

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© Activities for Learning, Inc. 2017

Fraction Chart

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© Activities for Learning, Inc. 2017

Fraction Chart

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© Activities for Learning, Inc. 2017

Fraction Chart

What is + ?

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© Activities for Learning, Inc. 2017

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Fraction Chart

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Fraction Chart

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© Activities for Learning, Inc. 2017

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Fraction Chart

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Fraction Chart

What is + ?

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© Activities for Learning, Inc. 2017

Fraction Chart

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18

18

18

18

18

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13

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13

15

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17

12

13

© Activities for Learning, Inc. 2017

Fraction Chart

What is + ?

1

14

14

14

14

12

12

110

110

110

110

110

110

110

110

110

110

18

18

18

18

18

18

18

18

19

19

19

19

19

19

19

19

19

13

13

13

15

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15

15

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16

16

16

16

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17

17

12

13

© Activities for Learning, Inc. 2017

Fraction Chart

What is + ?

1

14

14

14

14

12

12

110

110

110

110

110

110

110

110

110

110

18

18

18

18

18

18

18

18

19

19

19

19

19

19

19

19

19

13

13

13

15

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15

15

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16

16

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17

17

12

13

© Activities for Learning, Inc. 2017

Fraction Chart

What is + ?

1

14

14

14

14

12

12

110

110

110

110

110

110

110

110

110

110

18

18

18

18

18

18

18

18

19

19

19

19

19

19

19

19

19

13

13

13

15

15

15

15

15

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16

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16

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16

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17

17

17

17

17

12

13

56

© Activities for Learning, Inc. 2017

Fraction Chart

What is of ?

1

14

14

14

14

12

12

110

110

110

110

110

110

110

110

110

110

18

18

18

18

18

18

18

18

19

19

19

19

19

19

19

19

19

13

13

13

15

15

15

15

15

16

16

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17

17

17

12

12

© Activities for Learning, Inc. 2017

Fraction Chart 1

14

14

14

14

12

12

110

110

110

110

110

110

110

110

110

110

18

18

18

18

18

18

18

18

19

19

19

19

19

19

19

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19

13

13

13

15

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What is of ?12

12

© Activities for Learning, Inc. 2017

Fraction Chart 1

14

14

14

14

12

12

110

110

110

110

110

110

110

110

110

110

18

18

18

18

18

18

18

18

19

19

19

19

19

19

19

19

19

13

13

13

15

15

15

15

15

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What is of ?13

12

© Activities for Learning, Inc. 2017

Fraction Chart 1

14

14

14

14

12

12

110

110

110

110

110

110

110

110

110

110

18

18

18

18

18

18

18

18

19

19

19

19

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19

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19

13

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13

15

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17

What is of ? That’s multiplying fractions! 13

12

© Activities for Learning, Inc. 2017

Multiplying Fractions

Multiplying is not exclusively repeated addition.

1 2 × = + ? 1

21 2

4 × 4 = 4 + 4 + 4 + 4

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Multiplying Fractions

Multiplying is not exclusively repeated addition.

Area is a better model.

4 × 4 =

© Activities for Learning, Inc. 2017

Multiplying Fractions

One half of one half

1 2 × = 1

2

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Multiplying Fractions

1 2 × = 1

2

One half of one half

© Activities for Learning, Inc. 2017

Multiplying Fractions

1 2 × = 1

2

One half of one half

© Activities for Learning, Inc. 2017

Multiplying Fractions

One half of one half

1 2 × = 1

21 4

© Activities for Learning, Inc. 2017

Multiplying Fractions

One half of one half

1 2 × = 1

21 4

© Activities for Learning, Inc. 2017

Multiplying Fractions

2 3 × = 3

4

Three fourths of two thirds

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Multiplying Fractions

2 3 × = 3

4

Three fourths of two thirds

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Multiplying Fractions

2 3 × = 3

4

Three fourths of two thirds

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Multiplying Fractions

2 3 × = 3

4

Three fourths of two thirds

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Multiplying Fractions

Three fourths of two thirds

2 3 × = 3

4 6

12

© Activities for Learning, Inc. 2017

Multiplying Fractions

2 3 × = 3

4 6

12

The total number of rectangles is 3 × 4.

© Activities for Learning, Inc. 2017

Multiplying Fractions

2 3 × = 3

4 6

12

The total number of rectangles is 3 × 4.

The number of colored crosshatched rectangles is 2 × 3.

© Activities for Learning, Inc. 2017

Process of separating into equal groups

w  either number of groups, or

w  size of the groups

What is Division?

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How many 2s in 6?

6 ÷ 2 = __

What is Division?

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How many 2s in 6?

6 ÷ 2 = __

Number of groups of 2s; 3 groups

What is Division?

© Activities for Learning, Inc. 2017

How many 2s in 6?

6 ÷ 2 = __

Two groups; 3 in each group

What is Division?

© Activities for Learning, Inc. 2017

Dividing Fractions

÷ = 1 2 1

112

12

14

14

14

14

13

13

13

How many 1/2s in 1?

© Activities for Learning, Inc. 2017

Dividing Fractions

112

12

14

14

14

14

13

13

13

÷ = 1 2 1

How many 1/2s in 1?

© Activities for Learning, Inc. 2017

Dividing Fractions

112

12

14

14

14

14

13

13

13

÷ = 2 1 2 1

© Activities for Learning, Inc. 2017

Dividing Fractions

112

12

14

14

14

14

13

13

13

How many 1/3s in 1?

1 3 1 ÷ =

÷ = 2 1 2 1

© Activities for Learning, Inc. 2017

Dividing Fractions

112

12

14

14

14

14

13

13

13

1 3 1 ÷ = 3

÷ = 2 1 2 1

© Activities for Learning, Inc. 2017

Dividing Fractions

1 6 1 ÷ = 6

1 5 1 ÷ = 5

1 4 1 ÷ = 4

1 3 1 ÷ = 3

÷ = 2 1 2 1

© Activities for Learning, Inc. 2017

Dividing Fractions

÷ = 1 2 3

How many 2/3s in 1?

1 6 1 ÷ = 6

1 5 1 ÷ = 5

1 4 1 ÷ = 4

1 3 1 ÷ = 3

÷ = 2 1 2 1

© Activities for Learning, Inc. 2017

Dividing Fractions

÷ = 1 2 3

How many 2/3s in 1?

1 6 1 ÷ = 6

1 5 1 ÷ = 5

1 4 1 ÷ = 4

1 3 1 ÷ = 3

÷ = 2 1 2 1

© Activities for Learning, Inc. 2017

Dividing Fractions

÷ = 1 2 3

3 2

1 6 1 ÷ = 6

1 5 1 ÷ = 5

1 4 1 ÷ = 4

1 3 1 ÷ = 3

÷ = 2 1 2 1

© Activities for Learning, Inc. 2017

Dividing Fractions

÷ = 1 2 3

3 2

÷ = 1 3 4

1 6 1 ÷ = 6

1 5 1 ÷ = 5

1 4 1 ÷ = 4

1 3 1 ÷ = 3

÷ = 2 1 2 1

How many 3/4s in 1?

© Activities for Learning, Inc. 2017

Dividing Fractions

÷ = 1 2 3

3 2

÷ = 1 = 1 3 4

1 6 1 ÷ = 6

1 5 1 ÷ = 5

1 4 1 ÷ = 4

1 3 1 ÷ = 3

÷ = 2 1 2 1

How many 3/4s in 1?

1 3

4 3

© Activities for Learning, Inc. 2017

Dividing Fractions

÷ = 1 2 3

3 2

÷ = 1 3 4

4 3

÷ = 1 2 5

5 2

÷ = 1 5 8

8 5

÷ = 1 4 7

7 4

Guide the student to making the discovery that the answers are the inverted form of the divisor, the number by which another number is to be divided.

1 6 1 ÷ = 6

1 5 1 ÷ = 5

1 4 1 ÷ = 4

1 3 1 ÷ = 3

÷ = 2 1 2 1

© Activities for Learning, Inc. 2017

Fraction Division War

Purpose: Practice in dividing fractions. To help the children realize the

quotient is the inverted form of the divisor.

Goal: To collect all, or most, of the cards by having the greatest quotient.

© Activities for Learning, Inc. 2017

Fraction Division War

© Activities for Learning, Inc. 2017

Fraction Division War

1

1

© Activities for Learning, Inc. 2017

Fraction Division War

1 2

1 4

= 2

= 4

1

1

© Activities for Learning, Inc. 2017

More Dividing Fractions

÷ = 1 4 1 4

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÷ = 8

More Dividing Fractions

÷ = 1 4 1 4

1 4 2

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More Dividing Fractions

÷ = 1 4 1 4

÷ = 2 × (1 ÷ ) 1 4 2 1

4

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More Dividing Fractions

÷ = 1 4 1 4

= 2 × 4 = 8

÷ = 2 × (1 ÷ ) 1 4 2 1

4

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More Dividing Fractions

÷ = 1 4 1 4

÷ = 2 × (1 ÷ ) = 2 × 4 = 8 1 4 2 1

4

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More Dividing Fractions

÷ = 1 4 1 4

÷ = 12 1 4 3 1 1

÷ = 2 × (1 ÷ ) = 2 × 4 = 8 1 4 2 1

4

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More Dividing Fractions

÷ = 1 4 1 4

÷ = 2 × (1 ÷ ) = 2 × 4 = 8 1 4 2 1

4

÷ = 3 × (1 ÷ ) 1 4 3 1

4 1

© Activities for Learning, Inc. 2017

More Dividing Fractions

÷ = 1 4 1 4

÷ = 2 × (1 ÷ ) = 2 × 4 = 8 1 4 2 1

4

= 3 × 4 = 12

÷ = 3 × (1 ÷ ) 1 4 3 1

4 1

© Activities for Learning, Inc. 2017

More Dividing Fractions

÷ = 1 4 1 4

1 4 2 1

4

÷ = 3 × (1 ÷ ) = 3 × 4 = 12 1 4 3 1

4 1

÷ = 2 × (1 ÷ ) = 2 × 4 = 8

© Activities for Learning, Inc. 2017

More Dividing Fractions

÷ = 1 4 1 4

÷ = 1 4

1 2

1 4 2 1

4

÷ = 3 × (1 ÷ ) = 3 × 4 = 12 1 4 3 1

4 1

÷ = 2 × (1 ÷ ) = 2 × 4 = 8

© Activities for Learning, Inc. 2017

More Dividing Fractions

÷ = 1 4 1 4

÷ = 2 1 4

1 2

÷ = 2 × (1 ÷ ) = 2 × 4 = 8 1 4 2 1

4

÷ = 3 × (1 ÷ ) = 3 × 4 = 12 1 4 3 1

4 1

© Activities for Learning, Inc. 2017

More Dividing Fractions

÷ = 1 4 1 4

÷ = × (1 ÷ ) 1 4

1 4

1 2

1 2

÷ = 2 × (1 ÷ ) = 2 × 4 = 8 1 4 2 1

4

÷ = 3 × (1 ÷ ) = 3 × 4 = 12 1 4 3 1

4 1

© Activities for Learning, Inc. 2017

More Dividing Fractions

÷ = 1 4 1 4

1 4 2 1

4

÷ = 3 × (1 ÷ ) = 3 × 4 = 12 1 4 3 1

4 1

= × 4 = 2 1 2

÷ = × (1 ÷ ) 1 4

1 4

1 2

1 2

÷ = 2 × (1 ÷ ) = 2 × 4 = 8

© Activities for Learning, Inc. 2017

More Dividing Fractions

÷ = 1 4 1 4

÷ = × (1 ÷ ) = × 4 = 2 1 4

1 4

1 2

1 2

1 2

÷ = 2 × (1 ÷ ) = 2 × 4 = 8 1 4 2 1

4

÷ = 3 × (1 ÷ ) = 3 × 4 = 12 1 4 3 1

4 1

© Activities for Learning, Inc. 2017

More Dividing Fractions

÷ = 1 4 1 4

÷ = × (1 ÷ ) = × 4 = 1 4

1 4

1 3

1 3

1 3

4 3

÷ = × (1 ÷ ) = × 4 = = 3 1 4

1 4

3 4

3 4

3 4

12 4

÷ = 2 × (1 ÷ ) = 2 × 4 = 8 1 4 2 1

4

÷ = 3 × (1 ÷ ) = 3 × 4 = 12 1 4 3 1

4 1

÷ = × (1 ÷ ) = × 4 = 2 1 4

1 4

1 2

1 2

1 2

© Activities for Learning, Inc. 2017

Harder Fraction Division War

1 2

1 4

1 6

2 3

*

© Activities for Learning, Inc. 2017

1

14

14

14

14

Fraction Chart

12

12

110

110

110

110

110

110

110

110

110

110

18

18

18

18

18

18

18

18

19

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19

19

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19

13

13

13

15

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15

15

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16

16

16

16

16

17

17

17

17

17

17

17

© Activities for Learning, Inc. 2017

Fraction Chart

Allow the student to explore the whole picture and relationships within the whole using the linear perspective.

© Activities for Learning, Inc. 2017

In Conclusion …

Math needs to be taught so95 percent is understood andonly 5 percent memorized.

Richard Skemp -- major pioneer in

mathematics education

© Activities for Learning, Inc. 2017

In Conclusion …

Our goal as a teacher of mathematics is to help our students transform, expand, and refine these beginning ideas into deeper mathematical thinking.

– Dr. Joan A. Cotter

© Activities for Learning, Inc. 2017

Taking the Fear Out of Fractions

presented by Kathleen Cotter Lawler based on the work of Dr. Joan A. Cotter

3 5

2 5