{#blank#}1{#/blank#}×3={#blank#}2{#/blank#}

{#blank#}3{#/blank#}×4={#blank#}4{#/blank#}

5×7{#blank#}3{#/blank#}7×8      5＋5＋5＋5{#blank#}4{#/blank#}4×5

32－12{#blank#}5{#/blank#}6×3      6×6{#blank#}6{#/blank#}12

42-7=        57-32=        5×3=        2×7=

9×4=         36+9=        3×8=        1×5=

35+25-50=               74-20-24=

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{#blank#}3{#/blank#}×9 < 40          55>6×{#blank#}4{#/blank#}