1. 1. Multiplying by 10,100,1000 Shortcut?S Add one 0 Multiply by 10
Add two 0’s
Add three 0’s
since 10 has one 0
since 100 has two 0’s
since 1000 has three 0’s

2. So how do we work these out?
730 ÷ 10 =
73 ( a zero was removed)
b) ÷ 100 =
( two zeros were removed)
c) ÷ 1000 =
(three zeros were removed)
Because division is the opposite of multiplication

3. L.O. To be able to divide whole numbers by 10,100 and 1000
By the end of the lesson, we will be able to:
divide any whole number by 10, 100, 1000
divide any whole number by multiples of 10,100,1000

4. What if the number does NOT
For numbers ending in 0
Divide by 10
Divide by 100
Divide by 1000
Remove one 0
Remove two 0s
Remove three 0s
since 10 has one 0
since 100 has two 0’s
since 1000 has three 0’s
What if the number does NOT
end in 0’s ??

5. 2. Dividing whole numbers with remainders
27÷5=
5 𝑟 2 𝑜𝑟 5.4 𝑜𝑟 5 2 5
34÷8=
4 𝑟 2 𝑜𝑟 4.25 𝑜𝑟 4 2 8

6. So how do we work these out?
18 ÷ 10
= 1 r 8 or 1.8
b) 374 ÷ 10
= 37 r 4 or 37.4
c) 257 ÷ 100
= 2 r 57 or 2.57
d) ÷ 1000
= 81 r 352 or
What’s the Pattern?
At this point explain how for a whole number the DECIMAL POINT IS HIDDEN AT THE END

7. For numbers NOT ending in 0
Divide by 10
Divide by 100
Divide by 1000
Move decimal point to the left once
Move decimal point to the left twice
Move decimal point to the left three times
since 10 has one 0
since 100 has two 0’s
since 1000 has three 0’s

8. Examples
23 ÷10 = 2 3 = ÷ 100 = = = 250

9. Examples
12350 ÷ 1000 = = ÷ 100 = 2 4 = 0.24
HERE EXPLAIN THAT THE DECIMAL POINT DOESN’T LIKE BEING ALONE SO WE PUT A 0 IN FRONT OF IT

10. 2500 ÷ 500
Explain cancelling 0s method  zeroes are cancelled in pairs

11. Summary: steps to success
By 10?
Move point once to make the number smaller
2. By 100?
Move point twice to make the number smaller
By 1000?
Move the point three times to make the number smaller
4. By a multiple of 10,100,1000?
Put numbers on top of each other, cancel pairs of zeros

12.
Answers
÷ 10

13.
Answers
÷ 100

14.
Answers
÷ 1000

15. Multiples of 10,100,1000
= 2
40 ÷ 20
4800 ÷ 600
56000 ÷ 800
= 8
= 70

16. L.O. To be able to divide whole numbers by 10,100 and 1000
INVENT A QUESTION for these two points
divide any whole number by 10, 100, 1000
divide any whole number by multiples of 10,100,1000