___ ones = ___ tens
63
87 ___ 86
3 + 3 = ___
5 + 5 = ___
5 + 6 = ___
7 + 4 = ___
4 + ___ = 11
11 − ___ = 4
11 − 7 = ___ 7 + ___ = 11
11 − ___ = 7 ___ + 7 = 11
5 tens + 1 tens = ___ tens
45 + 3 = ___
57 + 4 = ___
28 − 3 = ___