The fraction 42⁄82 expressed as a percentage is 51.22%. This rounded figure tells you how much of a whole the fraction represents in everyday terms.
When you reduce 42⁄82, you get the simpler fraction 21⁄41, which still corresponds to the same percentage. Both forms are useful depending on whether you need a clean fraction or a quick, visual sense of size.
In practical situations—like calculating grades, discounts, or statistics—using 51.22% makes it easy to compare numbers at a glance. The rounding to two decimal places keeps the value precise enough for most everyday needs.