20+50= | 80-30= | 58-8= | 70+6= | 91-8= |
45+3= | 36+4= | 85+30= | 54+9= | 28-6= |
23+20= | 77+5= | 24-7= | 87-50= | 25+30= |
72-9= | 23-8= | 57-40= | 45-3= | 37+8= |
15-9〇9 45-5〇40 57-50〇5
19-4= | 67-7= | 5+50= | 88-8= |
18-9= | 70+8= | 87-80= | 49-40= |
13-6= | 56-50= | 60+7= | 4+30= |
12-7◯5 45-5◯50 37-30◯5 16+3◯6+13
68-40 | 53-3 | 73-20 | 85-40 |