3×9+3={#blank#}1{#/blank#}       9÷9+1={#blank#}2{#/blank#}    81÷9－9={#blank#}3{#/blank#}

64÷8－4={#blank#}4{#/blank#}     8×9－20={#blank#}5{#/blank#}    14÷7+18={#blank#}6{#/blank#}

2×4÷8={#blank#}7{#/blank#}      30÷5×6={#blank#}8{#/blank#}    72÷（21－12）={#blank#}9{#/blank#} 

24÷8＋2={#blank#}1{#/blank#}

46－4×7={#blank#}2{#/blank#}

45－28÷7={#blank#}3{#/blank#}

6×3＋30={#blank#}4{#/blank#}

①50–30÷5                  ②9×2÷3           ③40–6+14

=20÷5                      =18÷3              =40–20

=4                           =6                  =20