I have been learning to use Place Value and Reversibility to solve problems
PLACE VALUE
62 - 47 =
60 - 40 = 20
20 - 7 = 13
13 + 2 = 15
REVERSIBILITY
47 + ___ = 62
If 62 - 47 = 15 then when you change the equation into an addition equation, the answer should be 15.
40 + 10 = 50
7 + 5 = 12
50 + 10 = 60
60 + 2 = 62
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