4 - 2 = ___ 1 - 1 = ___ 7 - 3 = ___
5 - 4 = ___ 9 - 2 = ___ 2 - 0 = ___
15 - 6 = ___ 15 - 8 = ___ 1 - 1 = ___
12 - 9 = ___ 6 - 0 = ___ 5 - 4 = ___
14 - 8 = ___ 17 - 9 = ___ 6 - 0 = ___
9 - 0 = ___ 14 - 9 = ___ 6 - 2 = ___
4 - 4 = ___ 8 - 6 = ___ 5 - 4 = ___
4 - 3 = ___ 9 - 1 = ___ 5 - 1 = ___
12 - 5 = ___ 6 - 0 = ___ 3 - 1 = ___
1 - 1 = ___ 2 - 0 = ___ 6 - 1 = ___