21/91 as a percentage is 23.08%. This number tells you how much of a whole the fraction represents when you look at it on a scale of 100. It’s a quick way to see the size of the fraction in everyday terms.
The fraction 21/91 can be simplified to 3/13, which still gives the same percentage. Both forms show that the part is a little less than a quarter of the whole, because 25% would be exactly one fourth.
Knowing the percentage is handy for things like budgeting, grading, or any situation where you need to compare parts of a whole. Just remember that 23.08% means roughly 23 out of every 100 units.
