81.82% is the percentage form of the fraction 54/66. This number tells you how much of a whole 54 is when the whole is 66.
The fraction 54/66 can be simplified to 9/11, which is still the same value, just written in a smaller form. Whether you look at 54/66 or 9/11, the percentage stays the same.
Knowing the percentage helps you compare this fraction to other numbers quickly. It shows that 54 is a little more than four‑fifths of 66, making it a useful reference in everyday calculations.
