8 × 9=
6 × 7 =
5 × 4 =
9 × 7 -7 =
5 × 6 =
4 × 9 =
7 × 8 =
6 × 9 + 9 =
32-8 =
40 + 28 =
56 + 9 =
67-40 + 21 =
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