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Rounding numbers to estimate the sum 256+321
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Rounding numbers to estimate the sum 256+321

User Peza
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add those to numbers together. you will get 577. if the last number is over 5 you round up. to 580.
User Mikebmassey
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256\approx260\\\\321\approx320\\\\therefore\\\\256+321\approx260+320=\boxed{580}
User Flutterian
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