Adding & Subtracting Rational Numbers

Adding Fractions

100

-5 1/3 + 8 2/3

3 1/3

200

4 5/6 + (-1 2/3)

3 1/6

300

-18 7/9 + 7 4/9

-11 1/3

400

3 1/4 + 7 3/4

11

500

-12 7/8 + -2 1/2

What is - 15 3/8

Subtracting Fractions

100

-8 1/2 - 4

-12 1/2

200

7 3/8 - (-2 1/8)

9 1/2

300

-26 2/5 - ( -11 1/5)

 -15 1/5

400

14 1/7 - ( -3 3/14)

17 5/14

500

-5 3/6 - ( -10 2/3)

5 1/3

Adding Decimals

100

-13.4 + 8.6

-4.8

200

7.51 + 22.08

29.59

300

-41.90 + 22

19.90

400

117.4 + 8.93

126.33

500

- 328.17 + 63.40

-264.77

Subtracting Decimals

100

-3.7 - 14.9

-18.6

200

22.43 - 4.07

18.36

300

-81.36 - 41.93

-123.29

400

7.85 - ( -31.03)

38.88

500

206.14 - 131.78

74.36

Math Rules

100

What is the sign of your answer when you add two negative numbers? 

Negative

200

Double Jeopardy!!!! How can you know what the sign of your answer will be for the sum of a negative and a positive number?

The answer will have the same sign as the number with the greatest absolute value.

300

Name a rule we use in math to remind us how to change a subtraction problem into an addition problem.

Keep, Change, Opposite OR Add the opposite

400

What has to be done before you can add or subtract fractions?

Make equivalent fractions where the denominators are the same.

500

What has to be done before you can add or subtract decimals?

Line up the decimal point (and add zeros as place holders)