Estimate the sum by rounding each number to the nearest ten.
38 + 84 =
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Round each number to the greatest place. Then add or subtract to estimate.
667 + 543 =
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Round each number to the greatest place. Then add or subtract to estimate.
252 - 193 =
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Round each number to the greatest place. Then add or subtract to estimate.
310 + 950 =
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