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Rounding
Multiplying decimals by 10s
word problems and estimating
Multiplying decimals 2.0
100

Round 1.2 to the nearest whole number

1

100

1.2 x 10

12

100

Kiely sails her boat 4.5 miles every day. If she sails for 7 days, how far will she travel?

31.5 miles

100

0.3 x 9

2.7

200

Round 0.76 to the nearest tenth

0.8

200

4.3 x 100

430

200
Cd's are $15.25 each. How much will it cost to buy 3?

$45.75

200

4.2 x 4

16.8

300

Round 0.643 to the nearest hundredth

0.63

300

4.65 x 1000

4650

300

One gallon of water weighs about 8.3 pounds. ABout how much does 4.8 gallons weigh?

39.84 pounds

300

3.5 x 2.7

9.45

400

Round 4.789 to the nearest hundredth

4.79

400

1.4 x 10^1

14

400

One of the largest diamonds is the Star of Africa which is 530.2 carats. A carat is 0.2 gram. What is the mass of the star of Africa?

106.04 grams

400

8.26 x0.3

2.478

500

Round 3.599 to the nearest hundredth

3.60

500

5.3 x 10^2

530

500

Mrs. Olson wants to paint a wall so she needs to know the area of the wall. The length is 6.42 feet and the with is 8.9 feet. What is the area?

57.138 ft squared

500

8.9 x 7.6

67.64