20+50= 80-40= 7-6= 3+2=
2+5= 8-4= 70-60= 30+20=
20+5= -80= 69-5= 78+20=
32+10= 23+40= 66-5= 99-80= 36+40= 39-6= 12+30= 78-50= 40+9= 12+80= 12+50= 19-3= 45+40= 77-5= 19+20= 60+32= 50-10= 33-20= 18+60= 56-30= 99-8= 40+16= 78-50= 38-6=
56-20=
70-30=
88-60=
45-2=
29-5=
56+10=
69-40=
18-6=
