5/81 as a percentage is 6.17%. This small number shows how a tiny part of a whole can be expressed in everyday terms. When you see 6.17%, you know it represents the same value as the fraction 5 out of 81.
The fraction 5/81 is a proper fraction, meaning the numerator is smaller than the denominator. It can be simplified no further because 5 and 81 share no common factors other than 1. In decimal form it is about 0.0617, which is why its percentage is just a bit above six percent.
Knowing the percentage helps when you need to compare parts of different totals. For example, if you had 81 items and you took 5 of them, you’d have taken roughly 6.17% of the whole set. This makes it easy to communicate the size of the portion in a familiar way.