12-7=      6+5=        5×2=        5×5=      2×4+5=

3×5=       4×2=       4×4=        1×5=      4×5+7=

80-8=      72-50=      9+48=      38-3=      3×4-8=

6×9=          8×8=          7×4=          9×2-7=

4×8=          7×0=          4×9=          4×7+7=

37+3=          8×6=          38-8=          8+8-8=

18-9=          4×0=          9×3=          8×7+4=

5×5=          56+30=        6×1+4=          7×6-7=

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