Positive and Negative Decimals

Add Decimals

100

-18.5 + 9.72

-8.78

200

3.42 + (-1.5)

1.92

300

-6.315 + (-2.7)

-9.015

400

-8.52 + 27

18.48

500

You have -$12.35 in your account. You deposit $20. How much is in your account now?

$7.65

Subtract Decimals

100

8.45 - 15.2

-6.75

200

-91.45 - 4.278

-95.728

300

-7.8 - (-8.2)

0.4

400

-16.5 - (-28)

11.5

500

You are 42 feet below sea level. You dive 70 feet more. What depth are you at?

-112 feet

Challenge

100

-15.6 + 12.87 - 1.07

-3.8

200

-3.7 - (-15.89) + 2

14.19

300

6.37 - 12.8 + (-5.09)

-11.52

400

-15.8 + 2.37 - 18.5

-31.93

500

-3.6 + 19 - (-12.75) + (-8.27)

19.88