6＋7={#blank#}1{#/blank#}

5＋8={#blank#}2{#/blank#}

7＋4={#blank#}3{#/blank#}

6＋6={#blank#}4{#/blank#}

9＋9={#blank#}5{#/blank#}

6+5{#blank#}1{#/blank#}5+6   2+7{#blank#}2{#/blank#}8     5+2{#blank#}3{#/blank#}17-7    12-2{#blank#}4{#/blank#}15-5

9+4{#blank#}5{#/blank#}8+6   11{#blank#}6{#/blank#}5+7   4+12{#blank#}7{#/blank#}8+7    9-6{#blank#}8{#/blank#}10-8

1820                    12+79            125+6              15-410

6+310-1              5-510-10              75+3 9-66