Multiplying Decimals By 10, 100, 1000

DECIMAL S

MULTIPLYING BY 10, 100 AND 1000

DECIMAL S

MULTIPLYING BY 10

DECIMALS

0.9 X 10 = 9 X 10 10

= 9 0.12 X 10 = 12 X 10 100

= 1.2

DECIMALS

5.6 X 10 =

= 9.21 X 10

6 5 X 10 10 56 10

X 10 = 56

21 =9 X 10 100

921 = 100 X 10

= 92.1

DECIMALS

7.1 X 10 = 7 1

X 10 10 = 71

0.54 X 10 = 54 X 10 100

= 5.4

DECIMALS

Did you notice that when you multiply a number by 10, a short cut to get the answer is to shift the decimal point 1 place to the right.

Example:

5 12 X 10 = 5 1 2

PRACTICE

1. 3. 6 X 10 36 = 10.2 2. 1. 02 X 10 9.6 = 5.4 3. 0. 96 X 10 52.3 =

DECIMAL S

MULTIPLYING BY 100

DECIMALS

7 0.7 X 100 = X 100 10

= 70 12 0.12 X 100 = X 100 100

= 12

DECIMALS

2.3 X 100 = 2 3 X 100 10 = 1.42 X

23 10

X 100 = 230

42 100 = 1 X 100 100 142 = 100 X 100 =

142

DECIMALS

5.9 X 100 = 5 9 X 100 10 = 7.04 X

59 10

X 100 = 590

4 100 = 7 X 100 100 704 = 100 X 100 =

704

DECIMALS

Did you notice that when you multiply a number by 100, a short cut to get the answer is to shift the decimal point 2 places to the right.

Example:

5 12 X 100 = 5 1 2 0

PRACTICE

1. 6. 1 X 100 610 =

2. 7. 25 X 100 = 725 3. 0. 29 X 100 29 = 820 4. 8. 2 X 100 = 5. 4. 67 X 100 467 =

DECIMAL S

MULTIPLYING BY 1000

DECIMALS

6 0.6 X 1000 = X 1000 10

= 600 25 0.25 X 1000 = 100 X 1000

= 250

DECIMALS

7.8 X 1000 = 7 8 X 1000 10 = 3.09 X

78 10

X 1000 = 7800

9 1000 = 3 X 1000 100 309 = 100 X 1000 =

309

DECIMALS

4 8.4 X 1000 = 8 10 X 1000 84 = X 1000 = 8400 10 52 6.52 X 1000 = 6 X 1000 100 652 = 100 X 1000 = 6520

DECIMALS

Did you notice that when you multiply a number by 1000, a short cut to get the answer is to shift the decimal point 2 places to the right.

Example:

5 12 X 1000 = 5 1 2 0 0

PRACTICE

1. 0. 01 X 1000 10 = 3470 2. 3. 47 X 1000 = 800 3. 0. 8 X 1000 = 21 500 4. 21. 5 X 1000 = 16 030

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