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Round 47 to the nearest ten.
Round both 21 and 7 to the nearest ten.
21 rounds to and 7 rounds to .
Then, add the rounded numbers to estimate the sum. The sum of the rounded numbers is
Round both 13 and 8 to the nearest ten.
13 rounds to and 8 rounds to .
Then, add the rounded numbers to estimate the sum. The sum of the rounded numbers is
Round both 31 and 59 to the nearest ten.
31 rounds to and 59 rounds to .
Then, add the rounded numbers to estimate the sum. The sum of the rounded numbers is
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