1. Multiplying by 10, 100, 1000
By the end of the lesson we will be able to:
multiply any whole number by 10, 100, 1000
multiply any whole number by multiples of 10,100,1000

2. What happens when we multiply a number by 10?
The value of each digit increases 10 times!
When 46 is multiplied by 10, the 6 units becomes 6 tens and the 4 tens becomes 4 hundreds
46 × 10 = 460

3. 7 x 10
Thousands
Hundreds
Tens
Units 7

4. 4 x 10
Thousands
Hundreds
Tens
Units 4

5. 38 x 10
Thousands
Hundreds
Tens
Units 3 8

6. 91 x 10
Thousands
Hundreds
Tens
Units 1 9

7. 268 x 10
Thousands
Hundreds
Tens
Units 6 8 2

8. 999 x 10
Thousands
Hundreds
Tens
Units 9

9. What happens when we multiply a number by 100?
The value of each digit increases 100 times!
When 46 is multiplied by 100, the 6 units becomes 6 hundreds and the 4 tens becomes 4 thousands
46 × 100 = 4600

10. 4 x 100
Thousands
Hundreds
Tens
Units 4

11. 82 x 100
Thousands
Hundreds
Tens
Units 8 2

12. 6 x 1000
Thousands
Hundreds
Tens
Units 6

13. SHORTCUT Add one 0 Multiply by 10 Multiply by 100 Multiply by 1000
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

14. 42 × 300
Timmy thinks about how he can use what he knows about multiplying by 10,100,1000 to work this multiplication quickly
12600

15. Process 2. By 100? Add two zeros 3. By 1000? Add three zeros
1. By 10? Add one zero
2. By 100? Add two zeros
3. By 1000? Add three zeros
4. By a multiple of 10,100 or 1000? split up the multiplication, so that you multiply by 10, 100,1000
ex. 53 x 400 = 53 x 4 x 100

16. TASK (BINGO) Draw a 3 x 3 grid as shown below:
Place any nine numbers below into the grid (repeats forbidden)
Who finishes a horizontal line first  won the line
Who finishes house first  won the house 16

17. TASK (BINGO)
What is 356 x 10?
3560 17

18. TASK (BINGO)
What is 52 x 100?
5200 18

19. TASK (BINGO)
What is 473 x 2000?
946000 19

20. TASK (BINGO)
What is 52 x 10?
520 20

21. TASK (BINGO)
What is 473 x 100?
47300 21

22. TASK (BINGO)
What is 473 x 10?
4730 22

23. TASK (BINGO)
What is 21 x 1000?
21000 23

24. TASK (BINGO)
What is 356 x 100?
35600 24

25. TASK (BINGO)
What is 35 x 20?
700 25

26. TASK (BINGO)
What is 35 x 100?
3500 26

27. TASK (BINGO)
What is 52 x 3000?
156000 27

28. TASK (BINGO)
What is 356 x 1000?
356000 28

29. TASK (BINGO)
What is 210 x 10?
2100 29

30. TASK (BINGO)
What is 21 x 50?
1050 30

31. TASK (BINGO)
What is 350 x 100?
35000 31

32. TASK (BINGO)
What is 627 x 10?
6270 32

33. Multiplying by 10, 100, 1000
By the end of the lesson we will be able to:
multiply any whole number by 10, 100, 1000
multiply any whole number by multiples of 10,100,1000

34. STP 7 Pg 20 Exercise 2b No. 1-6 and 32,33,34
Homework for MONDAY
STP 7 Pg 20 Exercise 2b No. 1-6 and 32,33,34