52/86 as a percentage is 60.47%. This is the rounded value you get when you compare the fraction to a whole. It tells you how much of 100 parts the fraction represents.
The fraction 52/86 can be simplified by dividing both numbers by their greatest common divisor, which is 2. That gives you 26/43, a smaller fraction that still means the same thing. Even after simplifying, the percentage stays the same.
Knowing the percentage makes it easy to compare this value with other numbers, like test scores or discounts. A value of 60.47% means a little more than half of the whole, which is useful information in many everyday situations.