I know you can round to the nearest integer, but can you round to the nearest .5 or something like that?

I have a GPM section in my schedule that is a calculated value, and it gives me the correct numbers. But usually in our schedules we like to round to the nearest half gpm. Is this possible?

Example: A calculated gpm that shows up as 0.3, we want to show up as 0.5

Ive looked around a bit but cant find a good answer.

Thanks in advance.