=8, 2×4, 4×2, 1×8, 8×1, 比2×3多1個2, =20, 2×10, 5×4, 4×5, 比4×6少4, =32, 4×8, 8×4, 乘數是4,被乘數是8的積, 8+8+8+8, =40, 5×8, 8×5, 10個4加起來, 4×10.

南一國小數學2上CH7 2、5、4、8的乘法

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