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

11-8=             10-2=             16-7=             18-10=

13-9=             16-9=             14-6=             19-9=

3+8-9=           12-5+8=           13-8+6=           4+9-7=