The fraction 26/66 is equal to 39.39% when expressed as a percentage. This rounded value shows how much of a whole the fraction represents.
You can simplify 26/66 to 13/33, which still has the same size. Even in its reduced form, the fraction is a little under two‑fifths of a whole, which matches the 39.39% figure.
Knowing the percentage helps when you compare it to other numbers, such as test scores or data sets. It makes the size of the fraction easy to understand at a glance.