19-4=
67-7=
5+50=
88-8=
18-9=
70+8=
87-80=
49-40=
13-6=
56-50=
60+7=
4+30=
23-5=
37+6=
86-50=
72-5=
31+5=
77-8=
63+30=
7+54=
15+50=
35-7=
6+33=
100-40=
8+48=
96-90=
54-3= 73-70= 15-9= 5+6=
13-5= 40+7= 69-9= 27-20=
6+8= 59-4= 12+6-9= 12-4-5=
37+50=
64-4=
40-20=
21+20=
89-60=
73-3=
66+3=
30+13=
75-40=
22-20=
73+0=
13-7=
