口算

5×7=         3×6=         5×0=

8×9=         7×7=         6×1=

4×3=         5×2=         4×8=

7×6=         3×8=         5×9=

8×8=         4×2=         5×6=

2×7=         6×9=         6×8=

9×9=         5×8=         4×5-8=

2×8+4=         5×5-7=         3×7+6=

9×7-7=         8×7-6=         3×9+8=

2×9-10=         7×4-5=         4×9-7=