10/15 as a percentage is 66.67%. This is the rounded value you get when you change the fraction into a percent.
The fraction 10/15 can also be simplified to 2/3, which is a common way to see the same part of a whole in a simpler form.
Seeing a fraction as a percent helps you understand how big a piece is compared to the whole, especially in everyday situations like discounts or test scores.
Remember, 66.67% tells you that the fraction represents about two‑thirds of the total.