四二十八       八四十        三六

五二十五        六三十        五九

1×2=              3×6=          2×7=          3×3=

5×5=               5×2=          5×4=          1×5=

2×5=               4×5=          3×5=          5×7=

3×7=               2×4=          1×9=          4×8=

8×3+8=                5×6+5=              5×7+5=

8×5-8=             5×8-5=           5×9-5=

8×4=                 5×7=                5×8=