12/57 as a percentage is 21.05%. This fraction is a little more than one‑fifth of a whole, so when you see it written as a percent it’s easy to compare with other numbers.
The fraction 12/57 can be simplified only a little, but it still shows a part of a whole that is not a clean number. That’s why converting it to a percent makes it clearer, especially in everyday situations like discounts or statistics.
In practical use, you might see 21.05% on a report or a chart. It tells you the same thing as the original fraction, just in a format that most people read quickly.
