The fraction 18/21 is 85.71% when expressed as a percentage. This value tells you how large 18 is compared to a whole of 21 in everyday terms.
If you simplify the fraction, 18 and 21 share a common factor of 3, giving you 6/7. Whether you use 18/21 or 6/7, the percentage stays the same because they represent the same part of a whole.
Seeing the number as a percent can be useful in real‑world situations, like calculating grades, discounts, or probabilities. An 85.71% result means you have a high proportion, just a little short of a full 100%.
Remember, percentages are a quick way to compare parts of a whole, and 85.71% shows that 18 out of 21 is a strong majority.