21/66 as a percentage is 31.82%. This tells you that the fraction represents a little less than one‑third of a whole. The number is rounded to two decimal places for easy reading.
If you reduce 21/66, you get the simpler fraction 7/22. Both fractions show the same size, just written in a different way. Knowing the percentage helps you compare it quickly with other numbers, like 25% or 50%.
In everyday life, you might see this kind of percentage when looking at test scores, discounts, or data charts. It gives a clear picture of how big a part of the total something is, without needing to work with the original fraction.
