Adding Fractions
-5 1/3 + 8 2/3
3 1/3
-8 1/2 - 4
-12 1/2
-13.4 + 8.6
-4.8
-3.7 - 14.9
-18.6
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?
Part 1 - negative Part 2 - positive
4 5/6 + (-1 2/3)
3 1/6
7 3/8 - (-2 1/8)
9 1/2
7.51 + 22.08
29.59
22.43 - 4.07
18.36
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.
-18 7/9 + 7 4/9
-11 1/3
-26 2/5 - ( -11 1/5)
-15 1/5
-41.90 + 22
-19.90
-81.36 - 41.93
-123.29
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.
Add the Opposite or Keep, Change, Change
3 1/4 + 7 3/4
11
14 1/7 - ( -3 3/14)
17 5/14
117.4 + 8.93
126.33
7.85 - ( -31.03)
38.88
What has to be done before you can add or subtract fractions?
Make the denominators the same
-12 7/8 + -2 1/2
- 15 3/8
-5 3/6 - ( -10 2/3)
5 1/3
- 328.17 + 63.40
-264.77
206.14 - 131.78
74.36
What has to be done before you can add or subtract decimals?
Line up the decimal point (and the place values)