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

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Presentation transcript:

MULTIPLYING BY 10, 100, 1000

WHAT HAPPENS WHEN WE MULTIPLY A NUMBER BY 10?

0 ThousandsHundredsTensUnits 7 7 x 10

0 ThousandsHundredsTensUnits 4 4 x 10

ThousandsHundredsTensUnits x 10 0

0 ThousandsHundredsTensUnits x 10

ThousandsHundredsTensUnits x 10 0

0 ThousandsHundredsTensUnits x 10

WHAT HAPPENS WHEN WE MULTIPLY A NUMBER BY 100?

00 ThousandsHundredsTensUnits 4 4 x 100

00 ThousandsHundredsTensUnits x 100

00 ThousandsHundredsTensUnits 6 6 x

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

TASK (BINGO) Draw a 3 x 3 grid as shown below: Place any nine numbers below into the grid (repeats forbidden)

TASK (BINGO) What is 52 x 10? 520

TASK (BINGO) What is 473 x 10? 4730

TASK (BINGO) What is 473 x 100? 47300

TASK (BINGO) What is 52 x 100? 5200

TASK (BINGO) What is 356 x 10? 3560

TASK (BINGO) What is 356 x 100? 35600

TASK (BINGO) What is 21 x 1000? 21000

TASK (BINGO) What is 473 x 1000?

TASK (BINGO) What is 35 x 10? 350

TASK (BINGO) What is 52 x 1000? 52000

TASK (BINGO) What is 356 x 1000?

TASK (BINGO) What is 35 x 100? 3500

TASK (BINGO) What is 210 x 10? 2100

TASK (BINGO) What is 350 x 100? 35000

TASK (BINGO) What is 21 x 10? 210

TASK (BINGO) What is 627 x 10? 6270

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

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