20/21 as a percentage is 95.24%. This fraction is just a little short of a whole, so the percentage looks very close to 100%. When you see a number like that, it tells you that the part is almost the entire amount.
The fraction 20/21 can be useful when comparing parts of a set. For example, if you have 21 items and you take 20 of them, you’ve kept about ninety‑five percent of the original group. It’s a handy way to see how much is left without dealing with decimals.
Because the percentage is rounded to two decimal places, the exact value is a tiny bit higher than 95.24%, but for most everyday uses that level of detail isn’t needed. It’s a quick way to communicate that something is nearly complete.
