15/21 as a percentage is 71.43%. This value comes from the same ratio, whether you write it as a fraction or a percent. It’s a handy number to remember when you need a quick estimate.
The fraction 15/21 can be reduced to 5/7, which still represents the same part of a whole. Knowing the simplified form makes it easier to compare with other fractions, like 1/2 or 3/4, in everyday situations.
In practical terms, 71.43% tells you that 15 out of 21 pieces make up just over two‑thirds of the total. You might see this percentage in things like test scores, discounts, or any scenario where a part of a group is measured.
