10/15 as a percentage is 66.67%.
The fraction 10/15 can be reduced to 2/3, which means you have two equal parts out of three. It’s a common way to show a part of a whole in math and everyday life.
When you see 66.67%, you’re looking at a rounded figure that tells you roughly two‑thirds of something. This kind of percentage is useful for quick estimates, like figuring out a discount or the portion of a task that’s finished.