2×5={#blank#}1{#/blank#}     4×5={#blank#}2{#/blank#}     5×6={#blank#}3{#/blank#}

8×5={#blank#}4{#/blank#}     5×10={#blank#}5{#/blank#}     5×0={#blank#}6{#/blank#}

4个2相加                                            2×4=8

6+6+6                       4×2                  5乘4

4 + 4+4 +4 +4           6×3                 乘数是6和3

3+3+3+3+3+3           5×4                 2+2+2+2

5 +5 + 5 +5                                        3×6

2乘4                                                    4×5