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Explain how to estmate 586- 321 two different ways

User Dantheta
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Estimating Sums and Differences: Explain how to estimate 368 + 231 two different ways. Explain how to estimate 586 – 321 two different ways. Why is it important to estimate before solving a problem? Which gives an estimate that is closer to the exact sum: rounding to the nearest ten or rounding to the nearest hundred
User Topka
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