In a class, the answers you turn in should be simplified.
should become before turning it in
In the "real world" though, there are probably lots of times when you don't necessarily want to do that. Lets say you are measuring things that are normally divided into 4 parts , i.e., fourths. You might have values like 1/4, 2/4, 3/4, and 4/4, and it might make perfect sense to leave them like that and not reduce them to 1/4, 1/2, 3/4, 1.