7 − 3 = ___
8 − 3 = ___
3 − 3 = ___
3 − 0 = ___
10 − 0 = ___
10 − 10 = ___
4 + ___ = 8
8 − 4 = ___
6 + 5 = ___
___ − 6 = 5
8 + 7 = ___
___ − 8 = 7
6 + ___ = 13
13 − ___ = 6
9 + ___ = 13
13 − ___ = 9
15 − ___ = 7 ___ + 7 = 15
15 − 7 = ___ 7 + ___ = 15
___ − 8 = 8 8 + 8 = ___