Powers of 10
Estimation
Multiplication
Word Problems
Inequalities
100

2.88 x 100 =

288

100

Estimate by rounding each number to its greatest place value and then multiplying:

3.66 x 217 ≈

4 x 200 = 800

100

0.3 x 0.2 = 

0.06

100

Each metal ball weighs 64.2 grams.  How much do 6 metal balls weigh in all?

385.2 grams

100

0.6 × 3 _____ 1.5

1.8 > 1.5

200

100,000 x 0.81 =

81,000

200

Estimate by rounding each number to its greatest place value and then multiplying.

521 x 3.5 ≈

500 x 4 = 2,000
200

0.03 x 8 =

0.24

200

Britney placed 20 weights on a scale during science class.  If each of the weights weighed 0.54 grams, what did the scale read?

10.8 grams

200

0.4 × 2.5 ______ 1.2

1 < 1.2

300

0.09 x 104 =

900

300

Estimate by rounding each number to its greatest place value and then multiplying.

8.8 x 5 ≈

9 x 5 = 45

300

4.9 x 1.3 =

6.37

300

Samantha is baking cookies. Each cookie requires 0.75 cups of flour. If she wants to bake 8 cookies, how many cups of flour will she need in total?

6 cups

300

0.9 × 1.1 _____ 0.8

0.99 > 0.8

400

31 x 0.01 =

0.31

400

Estimate by rounding each factor to the nearest whole number and then multiplying.

0.43 x 7.95 ≈

0 x 8 = 0

400

393 x 4.5 =

1,768.5

400

A car travels 0.6 miles per minute. How far will the car travel in 12 minutes?

7.2 miles

400

1.2 × 0.7 _____ 1.0

0.84 < 1.0

500

3,896.9 x 0.01 =

38.969

500

Estimate by rounding each factor to the nearest whole number and then multiplying.

8.80 x 2.29 ≈

9 x 2 = 18

500

99.8 x 0.51 = 

50.898

500

A water bottle holds 1.25 liters of water. If James buys 4 bottles, how many liters of water does he have in total?

5 liters

500

1.2 × 0.8 _____ 0.96

0.96 = 0.96

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