20/21 as a percentage is 95.24%. This fraction is just a little less than a whole, so when you turn it into a percent you get a number that’s very close to 100%.
The fraction 20/21 can be thought of as 20 equal parts out of a total of 21. Because the missing part is only one piece, the value stays high, which is why the percent is in the mid‑90s.
In everyday use, you might see 95.24% when a test score, a discount, or a success rate is almost perfect but not quite 100%. It’s a handy way to show that something is very close to being complete.
