Rewrite as an addition problem. Then solve.

1. 58 - 79
2. -33 - 86
3. -5 - 81
4. 40 - 92
5. -61 - 12
6. -10 - 13
7. -4 + 31
8. -12 - 16
9. -51 + 43
10. 10 - 23