Adding & Subtracting Rational Numbers

Adding Fractions

100

-5 1/3 + 8 2/3

What is 3 1/3

200

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

What is 3 1/6

300

-18 7/9 + 7 4/9

What is -11 1/3

400

3 1/4 + 7 3/4

What is 11

500

-12 7/8 + -2 1/2

What is - 15 3/8

Subtracting Fractions

100

-8 1/2 - 4

What is -12 1/2

200

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

What is 9 1/2

300

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

What is -15 1/5

400

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

17 5/14

500

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

What is 5 1/6

Adding Decimals

100

-13.4 + 8.6

What is -4.8

200

7.51 + 22.08

What is 29.59

300

-41.90 + 22

What is -19.90

400

117.4 + 8.93

126.33

500

- 328.17 + 63.40

What is -264.77

Subtracting Decimals

100

-3.7 - 14.9

What is -18.6

200

22.43 - 4.07

What is 18.36

300

-81.36 - 41.93

What is -123.29

400

7.85 - ( -31.03)

What is 38.88

500

206.14 - 131.78

What is 74.36

Math Rules

100

Part 1 - what is the sign of the sum of 2 negative numbers?

negative 

200

Double Jeopardy!!!! How can you know what sign 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

Give one of the 2 phrases or names we use in math to remind us how to change a subtraction sentence into an addition sentence.

Change-Opposite  or Additive Inverse

400

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

What is make the denominators the same

500

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

What is line up the decimal point (and the place values)