9/42 as a percentage is 21.43%. This value shows how much of a whole the fraction represents when we look at it in terms of hundredths.
The fraction 9/42 can be reduced to 3/14, which is a bit easier to picture. It means that for every 14 equal parts, you have 3 of them. In decimal form this is about 0.2143, which matches the percentage when multiplied by 100.
Using 21.43% is handy in everyday situations, like figuring out a discount or a test score. The rounded number is simple enough to work with, yet precise enough for most practical purposes.