42/78 as a percentage is 53.85%. This value tells you how much of a whole the fraction represents when you look at it on a scale of 100.
The fraction 42/78 can be reduced to its simplest form, 7/13, which still gives the same percentage. Seeing it as a percent makes it easier to compare with other numbers, especially when dealing with scores, discounts, or data that are already expressed in percentages.
In everyday situations, a result of 53.85% might indicate just over half of a quantity—like getting a little more than half the votes in a small poll, or scoring a little above the halfway mark on a test. It’s a quick way to understand the size of the fraction in familiar terms.