13/18 is equal to 72.22% when rounded to two decimal places.
The fraction 13/18 means you have 13 parts out of a total of 18 equal parts. It is a little more than half, but not quite three‑quarters. When you write it as a percent, it shows how much of a whole it represents in a way that is easy to compare with other numbers.
People use this percentage in everyday situations, like calculating grades, discounts, or scores. Remember that the 72.22% figure is rounded, so the exact value is a tiny bit different, but for most purposes the rounded number works just fine.