340÷38{#blank#}1{#/blank#}340÷40   404÷28{#blank#}2{#/blank#}400÷28      832÷32{#blank#}3{#/blank#}832÷4÷8

910÷76{#blank#}4{#/blank#}12      602÷69{#blank#}5{#/blank#}602×69          348÷58{#blank#}6{#/blank#}5

1.04×3.57{#blank#}1{#/blank#}3.57                3.2÷0.01{#blank#}2{#/blank#}3.2×0.01

2.4×3.5{#blank#}3{#/blank#}24×0.35             (★-0.7)×0.9{#blank#}4{#/blank#}★×0.9-0.7

(16×2)×28={#blank#}1{#/blank#} (16×4)×(28÷4)={#blank#}2{#/blank#}。

(448÷4)÷(28÷4)={#blank#}3{#/blank#} 448÷(16×2)={#blank#}4{#/blank#}。