Rounding to the Nearest Ten
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Answer
52 + 39 =
rounding 52 we need to go back to 50.
rounding 39 we need to go up to 40.
so the new addition form is:
50 + 2 + 40 -1 = 50 + 40 + 2 -1 = 90 + 1 = 91
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