I am learning to solve addition problems by going back through the tens.
34-7=47 (34-4+30-3=47)
65-8=57 (65-5=60-3=57)
72-9=63 (72-2=70-7=63
83-8=75 (83-3=80-5=75)
132-7=125 (132-2=130-5=125)
271-8=263 (271-1=270-7=263)
393-6=387 (393-3=390-3=387)
I solved these problems by going back to a tidy ten.Then I took away the one that I had left.
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