30+5 46-6 88-8 20+8 30+1
50
70
100
20
90
43-933 56+870 6元-4角5元4角
45+1660 88-5040 4元5角+5元5角10元
71-6= 35-10= 30-6= 13-7+40=
34-4= 60+18= 32+8= 67-40+5=
25+7= 87-6= 2+54= 10+6+8=