{#blank#}1{#/blank#}×3=12    30={#blank#}2{#/blank#}×5     {#blank#}3{#/blank#}×3=6×4

{#blank#}1{#/blank#}×8<70         2×{#blank#}2{#/blank#}<13         {#blank#}3{#/blank#}×6<45

6×{#blank#}4{#/blank#}<56         {#blank#}5{#/blank#}×3<26         4×{#blank#}6{#/blank#}<35

{#blank#}7{#/blank#}×5<42         5×{#blank#}8{#/blank#}<21          {#blank#}9{#/blank#}×9<80

90×{#blank#}1{#/blank#}=8100               673- {#blank#}2{#/blank#}=0             {#blank#}3{#/blank#}÷24×50=0

{#blank#}4{#/blank#}+460=830        {#blank#}5{#/blank#}-239=752              256÷{#blank#}6{#/blank#}=3……1