ROUNDING is a very important factor in Mathematical calculations. In MS SQL Server we offend use different function to round the mathematical data. I saw that developer face a common problem when rounding data. It may be mathematical rounding or financial rounding. The main cause of facing problem, it is not to shame to say a lot of developer doesn't have any idea about rounding and how it works. In this article I am trying to clear all the problem related to rounding. Hope you like it and find it useful.