80-60=
30+20=
69-9=
3+68=
46+5=
30-6=
27-9=
76+9=
44-7=
85+5=
46+3=
57+30=
48-6=
7+90=
56+4=
23+30+5=
45+9-4=
36-30+59=
8+78+10=
1+70◯ 17 92-9 ◯ 9 81-80◯ 80+6
24+3◯ 27 28 ◯ 68-50 25+9 ◯88-50
_____+15=20 20+_____=28 54-_____=4 26-8=_____-10