83-6=70+(13-6)
85-7=70+(5+3)
74-6=60+(14-6)
37-9=20+(17-9)
43-8=30+(13-8)
52-4=40+(12-4)
(1) 66-(6)=60 (2) 35+(30)=65
(1) 76-(46)=30 (2)30+23=53
(1)55+5=60 (2)23+8=31
6+(28)=34 50+(40)=90
38-8=30 28-4=24
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