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