5 tens, 6 ones
___ + ___ = ___
45
27
2, 4, 6, ___
3, 6, 9, ___
8 + 4 = ___
10 − 6 = ___
9 + 5 = ___
___ − 9 = 5
11 − 7 = ___ 7 + ___ = 11
11 − ___ = 7 ___ + 7 = 11