5＋2＋3={#blank#}1{#/blank#}

6＋4＋7={#blank#}2{#/blank#}

16＋3－9={#blank#}3{#/blank#}

11-10=         2+10=            18-8=

10+3=          16-6=            14-10=

13-3+4=        17-2-10=         15-2+4=

2+4=         8-4=         3+9=         5-2=         10-7=

5+7=         3+6=         6-6=         6+9=         2+8=

8+4=         0+5=         9-4=         5+8=         7+8=

14-4=         9+9=         11-10=         19-1=         16-4=

4+4+6=         10-1-9=         8-3+6=         6+4-5=

12-2+4=         3+5+9=         17-4+3=         9+9-7=