20/21 as a percentage is 95.24%. This number tells you how close the fraction is to a whole. When you see 95.24% you know the value is just a little short of 100%.
The fraction 20/21 means you have 20 equal parts out of a total of 21 parts. It’s a handy way to show something that is almost complete, like a project that is nearly finished.
Because the percentage is so high, 20/21 is often used to describe situations where almost everything is included, such as a test score of 20 correct answers out of 21 questions. It gives a quick sense of how large the portion is without needing to work with the fraction directly.