**How to round to the nearest one?**
https://everydaycalculation.com/rounding-common.php

Ans. 18.39. B) To round to nearest one, ten, hundred, thousand and so on: if the rounding digit is 0, 1, 2, 3, or 4, change all digits to the right of it to zeroes. if the rounding digit is 5, 6, 7, 8, or 9, add one to the rounding digit and change all digits to the right of it to zeroes. Example 3.

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