What's the opposite action of “rounding a number”? [closed]

Looking this up on Merriam-Webster these are the only definitions to, unround

1: to pronounce (a sound) without lip rounding or with decreased lip rounding 2: to spread (the lips) laterally

I'm putting together a mobile application that is gesture based (Tap to Round). Looking for a word that appropriately fits the opposite action.

Example of action:

There isn't one. You either round or don't round. If you don't round, then it means you retain the original figure or result of the calculation.

There is no opposite to rounding. A rounded number contains no information that allows anyone to recover the original. Nothing may be recovered from a rounded 3 except perhaps that the original value was between 3.5 and 2.5. The only to alternative to rounding is therefore to do nothing.

Nevertheless, if you mean that the user has an option to refine or alter the amount to their own choice, you might use:

fine-tune = to make very small changes to something in order to make it work as well as possible

Cambridge Dictionary

refine = If something such as a process, theory, or machine is refined, it is improved by having small changes made to it.

Collins Dictionary