81.00% is what you get when you turn the fraction 81⁄100 into a percentage.
The fraction 81⁄100 means 81 parts out of a total of 100 equal parts. Because the denominator is already 100, the numerator directly tells you the percent value.
In everyday life, you’ll see this kind of number when dealing with scores, discounts, or statistics. For example, a test score of 81 out of 100 is the same as getting 81.00 % correct.
Remember, when the denominator is 100, the fraction’s numerator is the same as the percentage, just add the percent sign and you’re done.