5/55 as a percentage is 9.09%. This short number tells you how big the fraction is compared to a whole.
The fraction 5/55 can be simplified to 1/11, which is the same value in a smaller form. Whether you write it as 5/55, 1/11, or 9.09%, the amount stays the same.
Knowing the percentage makes it easy to compare with other numbers, like a discount or a test score. It shows that the part is just a little bit more than nine percent of the whole.
