The term you are looking for is "rounding." Rounding is the process of adjusting the digits of a number to make it simpler or to make it easier to work with, typically by increasing or decreasing the number to the nearest place value (such as the nearest ten, hundred, or thousand). For example, rounding the number 253 to the nearest ten gives you 250, while rounding 258 to the nearest ten gives you 260.
to estimate or make a number less accurate by increasing or decreasing it ot a selected place value
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