21/54 as a percentage is 38.89%. This number shows how much of a whole the fraction represents when we look at it on a scale of 100.
The fraction 21/54 can be reduced to 7/18, which is a simpler way to think about the same part of a whole. Whether you use 21/54 or 7/18, the percentage stays at 38.89%, so the two forms are interchangeable for most everyday purposes.
When we write the percentage, we usually round it to two decimal places. That’s why you see 38.89% instead of a longer string of digits. This rounded value is easy to read and works well in reports, charts, and quick calculations.
