13/51 as a percentage is 25.49%. This is the rounded value you get when you change the fraction to a percent with two decimal places.
The fraction 13/51 means 13 parts out of a total of 51 equal parts. When you look at it as a percent, it shows how many hundredths of a whole it represents, which is about a quarter of the whole.
You can use this percentage whenever you need a quick estimate, like in a grade calculation or a simple survey result. It’s a handy way to see the size of the fraction without writing it as a fraction.