Topic 4

Multiply Decimals by Powers of 10

100

19.212 X 10²

1921.2

200

0.024 X 10³

24

300

92.3 X 10⁴

923,000

400

5.001 X 10¹

5.001

500

0.45 X 10⁵

45,000

Multiply Decimals by a Whole Number

100

1.7 X 12

20.4

200

4.02 X 9

36.18

300

95 X 5.7

541.5

400

0.89 X 21

18.69

500

279 X 0.3

83.7

Multiply a Decimal by a Decimal

100

0.2 X 4.6

0.92

200

5.4 X 0.1

0.54

300

23.7 X 4.4

104.28

400

13.2 X 0.3

3.96

500

0.8 X 0.5

0.40

Use Mental Math to Divide

100

32,000/40

800

200

2000/40

50

300

9000/30

300

400

40,000/50

800

500

70,000/700

100

Multiply Multi-digit Numbers

100

158 X 6

948

200

16 X 29

464

300

83 X 57

4731

400

154 X 35

5390

500

682 X 25

17,050