四七二十八

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4×6和6×4都用四六二十四这句口诀来计算．

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2×6{#blank#}3{#/blank#}3×4              6－6{#blank#}4{#/blank#}0

4×3{#blank#}5{#/blank#}90－78           34＋2{#blank#}6{#/blank#}64

3×5{#blank#}7{#/blank#}2×9              9×4{#blank#}8{#/blank#}2×8

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5×{#blank#}3{#/blank#}＝35                                        4＋3＋5＝3×{#blank#}4{#/blank#}