(a) Add: 3 + 9 = 12, write 2 carry 1. 2 + 8 + 1 = 11, write 1 carry 1. 0 + 4 + 1 = 5. Answer: 512 (b) Add: 5 + 5 = 10, write 0 carry 1. 0 + 9 + 1 = 10, write 0 carry 1. 1 + 2 + 1 = 4. Answer: 400 (c) Add: 0 + 6 = 6. 3 + 5 = 8. 6 + 0 = 6. Answer: 686 (d) Add: 5 + 9 = 14, write 4 carry 1. 3 + 9 + 1 = 13. Answer: 134 (e) Add: 9 + 7 = 16, write 6 carry 1. 0 + 8 + 1 = 9. 4 + 3 = 7. Answer: 796 (f) Add: 7 + 6 = 13, write 3 carry 1. 6 + 7 + 1 = 14. Answer: 143 (g) Add: 0 + 7 = 7. 8 + 0 = 8. 5 + 2 = 7. Answer: 787 (h) Add: 3 + 6 = 9. 3 + 6 = 9. 3 + 6 = 9. Answer: 999 (i) Add: 6 + 8 = 14, write 4 carry 1. 2 + 6 + 1 = 9. 8 + 2 = 10. Answer: 1094