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70－20{#blank#}4{#/blank#}90      56＋30{#blank#}5{#/blank#}89      37{#blank#}6{#/blank#}77－4

36－3{#blank#}7{#/blank#}33       45－2{#blank#}8{#/blank#}42       52－30{#blank#}9{#/blank#}31

90-20{#blank#}1{#/blank#}75-5                      74-3{#blank#}2{#/blank#}100-20                           30+40{#blank#}3{#/blank#}84-1

48-3{#blank#}4{#/blank#}8+21                       35+4{#blank#}5{#/blank#}90-60                            46+3{#blank#}6{#/blank#}80-50

80-40{#blank#}7{#/blank#}42+7                         6+52{#blank#}8{#/blank#}57-6                               94-2{#blank#}9{#/blank#}60+30