15/21 as a percentage is 71.43%. This fraction can be reduced to 5/7, which is a common ratio you might see in recipes, sports stats, or simple probability problems. The rounded percentage gives a quick way to understand how large the part is compared to a whole.
When you see 71.43%, it tells you that the part is a little more than two‑thirds of the whole. In everyday terms, if you had 21 pieces of candy and ate 15 of them, you would have enjoyed about 71.43% of the candy.
Knowing the percentage makes it easy to compare this fraction with others. For example, 3/4 is 75%, so 15/21 (or 5/7) is just a tiny bit smaller. This kind of quick comparison is useful in school projects, budgeting, or any situation where you need to gauge sizes at a glance.
