15-8= | 16-7= | 29-9= | 13-4+8= |
13-9= | 11-8= | 15-10= | 6+6-9= |
12-6= | 14-5= | 68-8= | 17-8+3= |
13-4= | 50+8= | 2+90= | 14-6= | 13-5+9= |
88-80= | 40+3= | 64-4= | 7+50= | 19-10-7= |
13+6= | 12+8= | 7+( )=11 | 14+5-8 |
7+8= | 20-7= | ( )+3=20 | 7-5+9= |
15-6= | 8+9= | 16-( )=10 | 19-6-9= |
18-3= | 16-8= | 8=( )-8 | 15-7+5= |
5+9= | 14-7= | ( )-6=13 | 17-3-6= |