75=12 466=40 808=88 178=9
7+4074 40+88+40
713-7 73-4074-30
68=+8 40+=47 56-=6
75=5+ +60= 63 48-=40
34=+30 4+=44 100-=80
50+3= 53-3= 7+40= 17-7=
8+10= 65-5= 3 +70= 39-9=
37-7= 68-8= 4+90= 30+8=
1+20= 90+7= 4+60= 99-9=