2 tens, 4 ones
___ + ___ = ___
10, ___, 12
8 − 2 = ___
9 − 3 = ___
4 + ___ = 8
8 − 4 = ___
9 + 8 = ___
___ − 9 = 8
4 + ___ = 11
11 − ___ = 4