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
What is the sign of your answer when you add two negative numbers?
Negative
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
Double Jeopardy!!!! How can you know what the sign of your answer 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
Name a rule we use in math to remind us how to change a subtraction problem into an addition problem.
Keep, Change, Opposite OR Add the opposite
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 equivalent fractions where the denominators are the same.
-12 7/8 + -2 1/2
What is - 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 add zeros as place holders)