13-5= 67-60= 72-8=
80-30= 4+72= 55-20=
56+6= 51-7= 86-4=
11-6= 80-3= 8+53=
37+3= 95-3= 97-60=
42-8= 27+9= 81+9=
30角=元 27角=元角