7 + 3 = ___
___ − 7 = 3
2 + 4 = ___
___ − 2 = 4
9 + 8 = ___
___ − 9 = 8
2 + 9 = ___
___ − 2 = 9
4 + 6 = ___
___ − 4 = 6