1. 2 + 9 = 11
2. 10 + 0 = 10
3. 10 + 0 = 10
4. 5 + 7 = 12
5. 10 + 10 = 20
6. 12 + 2 = 14
7. 11 + 5 = 16
8. 8 + 10 = 18
9. 3 + 4 = 7
10. 10 + 12 = 22
11. 12 + 10 = 22
12. 1 + 9 = 10
13. 8 + 1 = 9
14. 3 + 4 = 7
15. 5 + 3 = 8
16. 5 + 8 = 13
17. 12 + 3 = 15
18. 8 + 10 = 18
19. 4 + 1 = 5
20. 4 + 1 = 5