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A safe estimate is always rounded up to be "safe" (i.e. Estimating the total miles of a trip with a 22 mile leg and a 34 mile leg would be done using 25 and 35).

An ordinary estimate is just rounding to the nearest whole digit to estimate (i.e. Estimating the total miles of a trip with a 22 mile leg and a 34 mile leg would be done using 20 and 35).

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13y ago

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