3×4={#blank#}1{#/blank#}     5×8={#blank#}2{#/blank#}          6×7={#blank#}3{#/blank#}

9×3={#blank#}4{#/blank#}     7×9={#blank#}5{#/blank#}          2×4={#blank#}6{#/blank#}

3×8={#blank#}7{#/blank#}     5×5={#blank#}8{#/blank#}          6×8={#blank#}9{#/blank#}

4×5={#blank#}10{#/blank#}     6×2={#blank#}11{#/blank#}          3×7={#blank#}12{#/blank#}

5×5=                             3×2=                                  6×6=

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

7×3=                            4×7=                                  4×4=

28÷4=                           35÷5=                                42÷7=

56÷8=                           36÷9=                                21÷3=

550-60 =     420-20=     120-60 =     230+90 =     600+300=

9×4 =      6×7 =    30÷5 =    19÷3 =    15÷4=

加法算式：{#blank#}1{#/blank#}或{#blank#}2{#/blank#}

乘法算式：{#blank#}3{#/blank#}或{#blank#}4{#/blank#}

口诀：{#blank#}5{#/blank#}