___ ones = ___ tens
5 tens, 6 ones
___ + ___ = ___
27
44 ___ 44
12, 15, 18, ___
4 + 1 = ___
1 + 4 = ___
2 + 2 = ___
4 + ___ = 8
8 − 4 = ___
4 + 6 = ___
___ − 4 = 6