45/99 as a percentage is 45.45% (rounded to two decimal places). This value tells you how large the fraction is compared to a whole.
The fraction 45/99 can be reduced to 5/11, which still represents the same proportion. Whether you write it as a fraction or as 45.45%, the meaning stays the same: a little less than half of a whole.
In everyday situations, using the percentage makes it easier to compare sizes. For example, if you earned 45.45% of a possible score on a test, you know you got just under half of the total points. This quick view helps with budgeting, grading, or any place where a simple “percent” is more useful than a fraction.