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The front end estimate is 100. But estimating a single number, in isolation and without context, is a complete waste of time. If I had to add 117 to 1 trillion, I would estimate it as 0. If I had to add 117 to 0.0000000001, I would use the number as given - not use an estimate.
Also, if I had to divided the number by 13 I would use 117 since 117/13 = 9 but if I had to divided it by 24 I might estimate it as 120 because 120/24 = 5.

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8y ago

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To the nearest ten, 120

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8y ago
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Q: How do you estimate 117?
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