nine
8
-15
You need to add 18 to negative 8 to get 10.
To add 1/4 and 3/8, you first need to change 1/4 to show a denominator of 8 which would be 2/8. You can then add 2/8 + 3/8 to get 5/8.
you need to add 10
- 8 + 17 = 9 =========
14
12
15
-11
2
You need to add 7 (or +7)