11-4= 23+50= 62-60= 50+44=
9+37= 30+3= 100-40= 15-8=
13-5= 49-9= 56+20= 4+35=
68-30= 12-6= 16-7= 33-3=
8+60= 90-50= 68-6= 49+30=