9 + 5 = ___
___ − 9 = 5
7 + 3 = ___
___ − 7 = 3
9 + 8 = ___
___ − 9 = 8
6 + 3 = ___
___ − 6 = 3
4 + 6 = ___
___ − 4 = 6