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The front end estimate is 1000. But estimating a single number, in isolation and without context, is a complete waste of time. If I had to add 1374 to 1 trillion, I would estimate it as 0. If I had to add 1374 to 0.0000000001, I would use the number as given - not use an estimate.
Also,if I had to calculate 1374/13 I might estimate it by 1365 because 1365/13 = 105 can be calculated mentally.

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8y ago

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