Sums and Differences of Decimals

Estimating Sums and Differences

100

Estimate:

49 + 22.88

What is 72

200

Estimate:

179 + 277.1=

What is:

500

300

Estimate:

23.8 - 4.7=

What is 19

400

Estimate:

38.9 - 21.4

What is 20

500

Estimate:

86.9 - 18=

What is 70

Adding Decimals

100

Solve:

0.82 + 4.21

What is 5.03

200

Solve:

0.26 + 8.3

What is: 16.31

300

Solve:

9.1 + 7.21

What is: 16.31

400

Solve:

4.98 + 3.02

What is 8

500

Solve:

6.9 + 2.8=

What is: 9.7

Subtracting Decimals

100

Solve:

7.8-4.9

What is 2.9

200

Solve: 

$20.60 - $14.35

What is $6.25

300

Solve: 

43.90 - 7.52=

What is 36.38

400

Solve

65.90-28.38=

What is 37.52

500

Solve: 

15.03-4.12=

What is 10.91

Properties of Addition

100

Use mental math to solve:

12 + 3.04 + 8.28=

What is 23.32

200

Use mental math to solve:

6.97 + 4.15 =

What is 11.12

300

Use mental math to solve:

9.04 - 6.98=

What is 2.06

400

Use mental math to solve:

4.02 + 0.19 + 16.48

What is 20.69

500

Use mental math to solve:

1.05+3+4.28+0.95=

What is 9.28