11{#blank#}1{#/blank#}2＝9

13{#blank#}2{#/blank#}8＝5

7{#blank#}3{#/blank#}5＝12

12 – 7 =        12 – 4 =        12 – 9 =       12 – 6 =

13 – 5 =        13 – 9 =        13 – 7 =       13 – 4 =

8+{#blank#}1{#/blank#}=17          9+{#blank#}2{#/blank#}=16          9 +{#blank#}3{#/blank#}=18

17-8={#blank#}4{#/blank#}        16-9={#blank#}5{#/blank#}         18-9={#blank#}6{#/blank#}

17-{#blank#}7{#/blank#}=8          16-{#blank#}8{#/blank#}=9          18-{#blank#}9{#/blank#}=9