The fraction 21/100 is equal to 21.00% when expressed as a percentage. This means that if you have 21 parts out of a total of 100, you're dealing with 21% of the whole. It's a fairly common percentage that you might encounter in various situations, like test scores, sales discounts, or statistical data.
To put this percentage into perspective, it's just over one-fifth of the total. If you're looking at a pie chart, 21% would take up about a fifth of the circle. In practical terms, if you had a group of 100 people and 21 of them wore red shirts, you could say that 21% of the group was wearing red. This fraction and percentage are useful for understanding parts of a whole in many everyday scenarios.