The fraction 15/27 expressed as a percentage is 55.56%. This tells you that the part represented by 15 out of 27 is just over half of the whole.
If you simplify 15/27, you get 5/9, which still equals the same 55.56%. Both forms show the same relationship between the part and the whole.
Knowing the percentage helps you compare this fraction to other numbers easily, whether you’re working with grades, budgets, or any situation where a quick sense of proportion is useful.