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=