Show:
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

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

Part 2 - what is the sign of the sum of 2 positive numbers?

What is Part 1 - negative  Part 2 - positive

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!!!! 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
-18 7/9 + 7 4/9
What is -11 1/3
300
-26 2/5 - ( -11 1/5)
What is -15 1/5
300

-41.9 + 22

What is 19.9

300

-81.36 - 41.93

What is -123.29

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.

What is Add the Opposite or Keep, Change, Change

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

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

17  5/14

400

117.4 + 8.93

126.33

400

7.85 - ( -31.03)

What is 38.88

400

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

What is make the denominators the same

500
-12 7/8 + -2 1/2
What is - 15 3/8
500

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

What is 5 1/6

500

- 328.17 + 63.4

What is -264.77

500

206.14 - 131.78

What is 74.36

500

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

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