66/80 as a percentage is 82.50%. This number shows how much of the whole the fraction represents when it’s expressed in a way that’s easy to compare with other values.
The fraction 66/80 can also be simplified to 33/40, but the percentage stays the same. Whether you’re looking at test scores, discounts, or any other ratio, 82.50% tells you the part of the whole that’s covered.
In everyday use, rounding to two decimal places keeps the figure precise enough for most practical purposes while still being simple to read and understand.
