88/99 as a percentage is 88.89%. This is the rounded value you get when you express the fraction in percent form.
The fraction 88/99 can also be seen as a part of a whole where 99 units represent 100 %. When you take 88 of those units, you end up with a little less than nine‑tenths of the whole.
In everyday use, 88.89% might show up in things like test scores, discounts, or any situation where you need to compare a portion to a total. It’s a quick way to understand how large a part the 88 is compared to 99.