Timing to the nearest one hundredth of a second has a degree of accuracy of ±0∙005 seconds. When rounding to the nearest one tenth of a second (0∙1), divide the degree of accuracy by two.

The process is similar to when you are rounding whole numbers. Numbers that end in a number smaller than 5 are rounded down to the nearest tenth or hundredth. Numbers that end in a 5 or a number ...