21/66 as a percentage is 31.82%. This is the rounded value you’ll see most often when the fraction is expressed as a percent.
The fraction 21/66 can be simplified to 7/22, which still represents the same part of a whole. Whether you write it as 21/66, 7/22, or 31.82%, it describes a little less than one‑third of something.
Knowing the percent form makes it easy to compare with other numbers, such as test scores or sales figures. It’s a quick way to see that the portion is just under a third of the total.
