12 + 37 + 47
12 + 37 + 47 = (10 + 30 + 40) + (2 + 7 + 7) = 80 + 16 = 96
It is important to visualize well the operation, being able to separate and put together the numbers that are easy to calculate together. This makes it easier to solve the addition in this problem.
MH
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