80/81 as a percentage is 98.77%. This fraction is very close to a whole, so its percent value is just a little under 100 %. When you see this number, think of it as “almost all” of something.
The fraction 80/81 can appear in problems about probability, like the chance of not drawing a specific card from a deck of 81 cards after one draw. In such cases, the 98.77 % tells you how likely it is to get any other card.
Because the value is so high, it’s useful for showing how effective a method or product is when it succeeds almost every time. Whether you’re comparing test scores or quality control results, 98.77% gives a clear picture of near‑perfect performance.
