Fill in the blanks with the correct number.
1. 2 + 8 = 8 + 2
2. 5 + 4 = 1 + 8
3. 8 + 4 = 1 + 11
4. 7 + 2 = 3 + 6
5. 9 + 2 = 10 + 1
6. 1 + 9 = 5 + 5
7. 4 + 8 = 6 + 6
8. 10 + 4 = 7 + 7
9. 1 + 7 = 0 + 8
10. 7 + 7 = 9 + 5
11. 20 + 4 = 21 + 3
12. 6 + 4 = 2 + 8
13. 7 + 10 = 10 + 7
14. 11 + 1 = 6 + 6
15. 10 + 2 = 6 + 6
16. 19 + 1 = 20 + 0