80×30{#blank#}1{#/blank#}240            89×11{#blank#}2{#/blank#}98×9         24×28{#blank#}3{#/blank#}12×56

33×22{#blank#}4{#/blank#}32×23         37×56{#blank#}5{#/blank#}56×37        43×22{#blank#}6{#/blank#}23×42

840÷4=         11×60=            600÷20=         23×30=

18×20=         880÷44=           25×40=           630÷30=

{#blank#}1{#/blank#}+28=100      260-{#blank#}2{#/blank#}=200

{#blank#}3{#/blank#}-20=50        28×{#blank#}4{#/blank#}=560

960÷{#blank#}5{#/blank#}=30         {#blank#}6{#/blank#}÷28=20