64/99 as a percentage is 64.65%. This is the rounded value you get when you change the fraction to a percent with two decimal places. It shows that the fraction is a little over half of a whole.
The fraction 64/99 is already in its simplest form because 64 and 99 share no common factors other than 1. It is close to the familiar 2/3 (which is about 66.67%), but a bit smaller.
In everyday situations, you might see this percentage when comparing parts of a whole, such as scores, survey results, or market shares. Knowing the percent makes it easy to understand the size of the part at a glance.
Remember, whenever you need to talk about 64/99, you can simply say 64.65%, and most people will get the idea quickly.