The Atom Quick! Time yourself writing the numbers from 1000-1050. Then, multiply the time by 20,000.
Multiply by 10, 100, 1000, etc...
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Key idea:
To be able to multiply a number by 10, 100 and 1000
WILF:
Hi, I’m Wilf, pleased to meet you!
What I’m Looking For
Children who can multiply by 10, 100 and 1000,
then say or write the new number they have made.
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In the decimal system, the number in each column is 10 times bigger than the number
to its right.
Th h t u
1 1 1 1
x10x10x10
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Th h t u
66
x10
If we multiply any digit by ten it will move into the next column
We must put a 0 in the empty units column to hold the place so 6 x 10 = 60
0
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Let’s look at another number
23 x 10 = 230
Th h t u
2 3
x10
2
x10
3Then we must remember to put the zero
in to the hold the digits in place!
0
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Let’s try these together!
48 x 10 =
93 x 10 =
134 x 10 =
256 x 10 =
889 x 10 =
480
Write the answers on your whiteboards
930
1,3402,5608,890
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Th h t u
66
If we multiply 6 by a hundred it will move up two columns
X 100
We must put a 0 in the empty columns to hold the place – 6 x 100 = 600
0 0
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Let’s try these together!
8 x 100 =
15 x 100 =
28 x 100=
134 x 100 =
267 x 100 =
800
Write the answers on your whiteboards.
1,5002,800
13,400
26,700
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Th h t u
66
If we multiply 6 by a thousand it will move up three columns
We must put a 0 in the empty columns to hold the place – 6 x 1000 = 6000
00 0
x1000
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Let’s try these examples!
9 x 1000 =
13 x 1000 =
64 x 1000=
149 x 1000 =
352 x 1000 =
9,000
Write the answers on your whiteboards.
13,00064,000
149,000
352,000
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Now you are going to try some yourselves! You’re going to do some brain training with your partner.
Remember WILF: Children who can
multiply by 10 then say or write the new number
they have made.
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Time for some more brain training, but this time we’re multiplying by 100!
Remember WILF: Children who can
multiply by 100 and then say or write the new
number they have made.
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Now try multiplying by 1000 with your partner
Remember WILF: Children who can
multiply by 1000 then say or write the new
number they have made.
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Now try to see if you can improve your score. Can you try the last column on the sheet?
Remember WILF: Children who can
multiply by 10, 100 and 1000 then say or write the new number they
have made.
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TIME’SUP!
TIME’SUP!
TIME’SUP!
TIME’SUP!
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How did you do today? Can you remember the rules for multiplying by 10, 100 and 1000?
Remember WILF: Children who can
multiply by 10, 100 and 1000 then say or write the new number they
have made.