1. 6 + 0 = 2. 1 + 0 = 3. 2 + 5 = 4. 6 + 7 = 5. 9 + 7 = 6. 2 + 3 = 7. 9 + 7 = 8. 10 + 10 = 9. 9 + 9 = 10. 9 + 6 =

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