Topic 4

Multiply Decimals by powers of 10 (Exponents)

100

What is the solution to this problem: 

0.62 x 10

6.2 

200

What is the solution to this problem: 

0.0063 x 100

0.63 

.63

300

What is the solution to this problem: 

0.0024 x 1,000

2.4

400

What is the solution to this problem: 

19.212 x 10²

1921.2

500

What is the solution to this problem: 

92.3 x 10⁴

923,000.

Multiply a decimal and a whole number

100

Find the product: 

0.8 x 92= 

73.6

200

Find the product: 

81 x 0.7=

56.7

300

Find the product: 

6.7 x 11= 

73.7

400

Find the product: 

713 x 0.1= 

71.3

500

Find the product: 

1.1 x 406=

446.6

Multiply a decimal and a decimal

100

Find the product: 

0.11 × 0.6

0.066

200

Find the product: 

0.63 × 0.3 =

0.189

300

Find the product: 

0.9× 3.7

3.33

400

Find the product: 

6.24 × 8.2

51.168

500

Find the product: 

16.9 × 42.8 =

723.32

Where do you put the decimal? (multiplication)

100

Where does the decimal go to the ANSWER to this problem?

0.1 × 5 = ?

the answer is 0.5 and the decimal goes between the 0 and 5

200

Where does the decimal go to the ANSWER to this problem?

0.8 x 4= 

3.2 The decimal goes between the 3 and the 2

300

Where does the decimal go to the ANSWER to this problem?

7×0.2=

1.4 the decimal goes between the 1 and the 4

400

Where does the decimal go to the ANSWER to this problem?

7×0.9=?

6.3 The decimal goes between the 6 and the 3

500

Where does the decimal go to the ANSWER to this problem?

0.9×0.04=

0.036 the decimal goes in between 0 and 0

Estimate the product of a decimal and a decimal

100

Round each factor to the nearest whole number, and then multiply.
4.9 x 3.7

20

200

Round each factor to the nearest whole number, and then multiply.
6.5 x 2.5

21

300

Round each factor to the nearest whole number, and then multiply.
8.9 x 1.8

18

400

Round each factor to the nearest whole number, and then multiply.
7.6 x 2.46

16

500

Round each factor to the nearest whole number, and then multiply.
19.5 x 7.88

160