Review Time!!! Operations with Decimals

Fractions <--> Decimals

200

4/7 rounded to the nearest tenth

0.57

400

4.5

4 1/2 

600

.85

17/20

800

5/8 rounded to the nearest tenth

.63

1000

1/2

.5

Multiplying/Dividing by Base 10

200

12.1 x 100

1,210

400

9.563 x 10 =

95.630

600

52.1 x 1,000 =

52100

800

0.321 x 100

32.1

1000

59.86422 x 1000 =

59864.22

Adding Decimals

200

Add these decimals: 21.74 + 8.27

30.01

400

Add these decimals: 5.2 + 3.11

8.31

600

Add these decimals: 6.125 + 18.4729

24.5979

800

Add these decimals: 17 + 9.54

26.54

1000

Add these decimals: 4.67 + 29.1

33.77

Multiplying Decimals

200

Multiply these decimals: 0.12 * 7

0.84

400

Multiply 4.4 * 5.3 =

23.32

600

Multiply these decimals: 1.83 * 0.3

5.49

800

Multiply these decimals.  12.7 * 2.6 =

33.02

1000

Multiply these decimals: 1.246 x 3.4

4.2364

Subtracting Decimals

200

Subtract these decimals: 851.701 - 312.49

539.211

400

Subtract these decimals: 10.71 - 0.7

10.01

600

Subtract these decimals: 547.612 - 3.107

544.505

800

Subtract these decimals: 9.034 - 0.095

8.939

1000

Subtract these decimals: 1.72 - 0.8

0.92

DividingDecimals

200

Divide these decimals: 30.9 ÷ 3 

10.3

400

Divide these decimals: 60.5 ÷ 5

12.1

600

Divide these decimals: 1.272 ÷ 6

0.212

800

Divide these decimals: 3.25 ÷ 5 

0.65

1000

Divide these decimals: 267.3 ÷  11

24.3