3 + 4 = ___
4 + 3 = ___
4 + 1 = ___
1 + 4 = ___
6 + 1 = ___
___ = 3 + 7
2 + 2 = ___
2 + 3 = ___
7 + 7 = ___
7 + 6 = ___