Rounding 
From Wikipedia, the free encyclopedia Rounding a number means replacing it with a different number that is approximately equal to the original, but has a shorter, simpler, or more explicit representation. For example, the number 2.246 can be expressed with two decimals as 2.25, and the number 1.8 can be rounded to 2 with zero decimals (as an integer). Rounding is often done to obtain a value that is easier to report and communicate than the original. Rounding can also be important to avoid misleadingly precise reporting of a computed number, measurement or estimate. There are many types of rounding. For all the questions posed here, we'll use the following rules:

ExamplesThe number 4.1293 is rounded to 2 decimals as 4.13 because the 3rd decimal is greater than 5 The number 4.1293 is rounded to 3 decimals as 4.129 because the 4th decimal is less than 5 The number 5.62 is rounded to 0 decimals as 6 because the first decimal is greater than 5 The number is first computed as 14.1421 and then rounded to 1 decimal as 14.1 