{#blank#}1{#/blank#}         {#blank#}2{#/blank#}

{#blank#}3{#/blank#}         ÷1{#blank#}4{#/blank#}

1.6×1.8={#blank#}1{#/blank#}         16×0.18={#blank#}2{#/blank#}         0.16×1.8={#blank#}3{#/blank#}

2.26×0.92{#blank#}1{#/blank#}2.26÷0.92                   5.6÷0.5{#blank#}2{#/blank#}5.6×2

68.5×0.98{#blank#}3{#/blank#}68.5×（1﹣0.02）       7.5×1.2{#blank#}4{#/blank#}7.5÷1.2

42÷6=7   26×13=338   850÷34=25

①84÷12=

②260×13=

③850÷17=

④210÷30=

⑤26×130=

⑥1700÷68=

3.5×2.63.5           2.3×0.52.3

1×7.67.6              4.8×0.884.8