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MULTIPLYING BY 10, 100, 1000. WHAT HAPPENS WHEN WE MULTIPLY A NUMBER BY 10?

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Presentation on theme: "MULTIPLYING BY 10, 100, 1000. WHAT HAPPENS WHEN WE MULTIPLY A NUMBER BY 10?"— Presentation transcript:

1 MULTIPLYING BY 10, 100, 1000

2 WHAT HAPPENS WHEN WE MULTIPLY A NUMBER BY 10?

3 0 ThousandsHundredsTensUnits 7 7 x 10

4 0 ThousandsHundredsTensUnits 4 4 x 10

5 ThousandsHundredsTensUnits 38 38 x 10 0

6 0 ThousandsHundredsTensUnits 19 91 x 10

7 ThousandsHundredsTensUnits 682 268 x 10 0

8 0 ThousandsHundredsTensUnits 999 999 x 10

9 WHAT HAPPENS WHEN WE MULTIPLY A NUMBER BY 100?

10 00 ThousandsHundredsTensUnits 4 4 x 100

11 00 ThousandsHundredsTensUnits 82 82 x 100

12 00 ThousandsHundredsTensUnits 6 6 x 1000 0

13 SHORTCUT Multiply by 10 Multiply by 100 Multiply by 1000 Add one 0 Add two 0’sAdd three 0’s since 10 has one 0 since 100 has two 0’s since 1000 has three 0’s

14 TASK (BINGO) Draw a 3 x 3 grid as shown below: Place any nine numbers below into the grid (repeats forbidden) 520 4730 47300 5200 3560 35600 473000 52000 356000 3500 210 350 2100 35000 6270 21000

15 TASK (BINGO) What is 52 x 10? 520

16 TASK (BINGO) What is 473 x 10? 4730

17 TASK (BINGO) What is 473 x 100? 47300

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

19 TASK (BINGO) What is 356 x 10? 3560

20 TASK (BINGO) What is 356 x 100? 35600

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

22 TASK (BINGO) What is 473 x 1000? 473000

23 TASK (BINGO) What is 35 x 10? 350

24 TASK (BINGO) What is 52 x 1000? 52000

25 TASK (BINGO) What is 356 x 1000? 356000

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

27 TASK (BINGO) What is 210 x 10? 2100

28 TASK (BINGO) What is 350 x 100? 35000

29 TASK (BINGO) What is 21 x 10? 210

30 TASK (BINGO) What is 627 x 10? 6270

31 Timmy thinks about how he can use what he knows about multiplying by 10,100,1000 to work this sum quickly

32 HOMEWORK FOR TOMORROW STP 7A PG 22 EXERCISE 2C NO. 1-6 AND 11,16 32,34

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