84-7＝{#blank#}1{#/blank#}      

84+7＝{#blank#}2{#/blank#}      

84-70={#blank#}3{#/blank#}

34+50{#blank#}1{#/blank#}74       45-20{#blank#}2{#/blank#}45+20     36+40{#blank#}3{#/blank#}96-20

45+30{#blank#}4{#/blank#}25+50    79-50{#blank#}5{#/blank#}59-30     76+20{#blank#}6{#/blank#}89

6×9=          8×8=          7×4=          9×2-7=

4×8=          7×0=          4×9=          4×7+7=

37+3=          8×6=          38-8=          8+8-8=

18-9=          4×0=          9×3=          8×7+4=

5×5=          56+30=        6×1+4=          7×6-7=

3+1315 15-315-4

16-107 7+1012+5