80/81 as a percentage is 98.77%. This number shows how close the fraction is to a whole, since it is only a tiny bit less than 100 %.
The fraction 80/81 means you have 80 parts out of a total of 81 equal parts. Because the denominator is only one more than the numerator, the value is very high, which is why the percentage is just under 99 %.
In everyday life, you might see this kind of ratio when something is almost complete—like a project that’s 80 out of 81 tasks finished. Saying it’s 98.77% done gives a quick, easy‑to‑understand picture of progress.
Remember that the figure is rounded to two decimal places, so the exact decimal would be a little longer, but 98.77% is the standard way to report it.