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The front end estimate is 600. But estimating a single number, in isolation and without context, is a complete waste of time.

If I had to add 555 to 1 trillion, I would estimate it as 0. If I had to add 555 to 0.0000000001, I would use the number as given - not use an estimate.

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8y ago

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To the nearest ten, 560

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8y ago
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Q: How do you estimate 555?
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