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
-41.90 + 22
What is 19.90
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)
400
117.4 + 8.93
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 1/3
500
- 328.17 + 63.40
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)
M
e
n
u