Multiplying Whole Numbers and Decimals

Estimation

100

Estimate to find the product: 6.132  x  2.72

18

200

Estimate to find the product: 8.539 x 2.28

18

300

Estimate to find the product: 19.61 x 5.20

100

400

Estimate to find the product: 6.71 x 11.2

77

500

Estimate to find the product: 8.565 x 4.555

45

Multiplying Whole Numbers

100

Find the product: 67 x 67

4,489

200

Find the product: 29 x 31

899

300

Find the product: 465 x 29

13,485

400

Find the product: 348 x 72

25,056

500

Find the product: 676 x 55

37,180

Multiplying Decimals

100

Find the product: 8.4 x 0.52

4.368

200

Find the product: 10.34 x 5.7

58.938

300

Find the product: 3.17 x 6.7

21.239

400

Find the product: 12.34 x 4.5

55.53

500

Find the product: 67.7 x 6.6

446.82

Word Problem

100

A flower grows 0.4 millimeters each day. How much does the flower grow in 15 days?

6 mm

200

Hudson runs 13.25 laps each morning. How many laps will he run at the end of 15 days?

198.75 laps

300

A bag of flour weighs 3.2 pounds.  How many pounds would 6.5 bags weigh?

20.8 pounds

400

A bag of sugar weighs 4.3 pounds. How many pounds would 6.7 bags weigh?

28.81 pounds

500

You need to buy yarn to make socks. Each sock takes 72.0635 inches of yarn. You want to make 3 pairs of socks. How much yarn do you need to buy?

432.381 inches of yarn

Multiplying Decimals x Powers of 10

100

42.3 x 1 = 

42.3

200

42.3 x 10 = 

423

300

42.3 x 10² = 

4,230

400

42.3 x 10³ = 

42,300

500

42.3 x 10⁴= 

423,000