Estimating
Powers of 10
Multiply Decimals
Dividing Decimals
Review
200

What is the best estimate for 4.56 x 7

35

200

12.1 x 100

1,210

200

Multiply these decimals. 21.74 x 0.7

15.218

200

Solve 2.34 ÷ 10

0.234 

200

Add these decimals.

3.53 + 2

5.53

400

What is the best estimate for 43.12 ÷ 7

6

400

9,563 x 10 =

95,630

400

Multiply these decimals. 6.125 x 18

110.25

400

Divide these decimals 14 ÷ 2.5

5.6

400

Subtract these decimals.

10.71 - 0.7

10.01

600

What is the best estimate for 119.876 ÷ 5

40

600

52.1 ÷  1,000 =

0.0521

600

A cantaloupe weighs 3.8 pounds. About how much do 5 cantaloupes weigh?

19 pounds or 19 lbs

600

Divide these decimals 8.5 ÷ 3.4

2 R17

600

Add these decimals.

2.54 + 1.82

4.36

800

What is the best estimate for 68.938 ÷  10

7

800

0.321 x 100 =

32.1

800

Jane charged $15.75 each hour for babysitting. If she babysat for 6 hours, how much did she make? 

$94.50

800

Norman earned $52.25 walking dogs. If he earned $4.75 for each dog he walked, how many dogs did Norman walk?

11

800

Subtract these decimals.

2.15 - 1.05

1.1 or 1.01

1000

What is the best estimate for 27.89 ÷ 9

3

1000

59.8 ÷  100 =

0.598

1000

Lila is buying supplies for her art project. She needs 3.5 yards of fabric, and each yard costs $4.50. How much will Lila spend on the fabric?

$15.75

1000

Trish and her 3 friends bought a package of pencils for $2.56. About how much will each friend pay if the cost is divided equally?

$0.85 

1000

Subtract these decimals.

1.72 - 0.8

0.92