Grade 5 Topic 4

Multiplying by powers of 10

100

3.65 x 10³

3,650

200

5.09 x 10²

509

300

17 x 10

170

400

18.039 x 10⁶

18,039,000

500

2.540 x 10⁰

2.540

Estimation

100

Estimate by rounding to the nearest whole number:

4.5 x 6.3

30

200

Estimate by rounding to the nearest whole number:

16.3 x 4.9

80

300

Estimate using compatible numbers:

19.6 x .41

10

400

Estimate using compatible numbers:

56.3 x .97

56

500

Estimate using compatible numbers:

3.9 x 8

32

Multiplying whole numbers and decimals

100

7 x 3.4

23.8

200

9 x 4.4

39.6

300

25 x 1.8

45

400

178 x .31

55.18

500

248 x 6.7

1,661.6

Multiplying Decimals

100

.3 x .4

.12

200

.12 x .6

.072

300

4.5 x 7.6

34.20

400

18.3 x .34

6.222

500

.093 x .12

.01116

Place the decimal point

100

Rewrite the answer with the correct decimal point:

.6 x .4= 2.4

.24

200

Rewrite the answer with the correct decimal point:

1.5 x 6= .9

9.0

300

Rewrite the answer with the correct decimal point:

.45 x .037= 16.65

.01665

400

Rewrite the answer with the correct decimal point:

.17 x 1.45= 24.65

.2465

500

Rewrite the answer with the correct decimal point:

.49 x 3.56= 174.44

1.7444