45/99 as a percentage is 45.45%. This rounded figure gives a quick sense of how large the fraction is compared to a whole.
The fraction 45/99 can be reduced to 5/11, which is a common simple form. Both versions represent the same value, so whether you see 45/99 or 5/11, the percentage stays at 45.45%.
Knowing this percentage is handy when you need to compare parts of a group, such as survey results or test scores. It tells you that just under half of the total is represented by the numerator.
