Adding Fractions
Subtracting Fractions
Adding Decimals
Subtracting Decimals
Math Rules
100
-5 1/3 + 8 2/3
What is 3 1/3
100
-8 1/2 - 4
What is -12 1/2
100
-13.4 + 8.6
What is -4.8
100
-3.7 - 14.9
What is -18.6
100

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.

What is Add the Opposite or Keep, Change, Change

200
4 5/6 + (-1 2/3)
What is 3 1/6
200
7 3/8 - (-2 1/8)
What is 9 1/2
200
7.51 + 22.08
What is 29.59
200
22.43 - 4.07
What is 18.36
200

DOUBLE JEOPARDY (Pick your own point value)

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

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

1. You have to make the denominators the same

2. You have to line up the decimal points (and the place values)

300
-18 7/9 + 7 4/9
What is -11 1/3
300
-26 2/5 - ( -11 1/5)
What is -15 1/5
300
-41.90 + 22
What is 19.90
300
-81.36 - 41.93
What is -123.29
300

3.5 • 2.7

9.45

400
3 1/4 + 7 3/4
What is 11
400

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

What is 17 5/4

400

117.4 + 8.93

What is 126.33

400
7.85 - ( -31.03)
What is 38.88
400

(1/5) • (-5)

-1

500

-12 7/8 + (-2 1/2)

What is - 15 3/8

500
-5 3/6 - ( -10 2/3)
What is 5 1/3
500
- 328.17 + 63.40
What is -264.77
500
206.14 - 131.78
What is 74.36
500

(4 • 2) ÷ 1/2

16

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