35/42 as a percentage is 83.33%. This value tells you how much of a whole the fraction represents when you look at it in terms of hundredths.
The fraction 35/42 can be reduced to its simplest form, 5/6. Both numbers share a common factor of 7, so dividing each by 7 gives the same proportion in a cleaner way.
Seeing the percentage makes it easy to compare the fraction with other numbers that are already expressed as percentages. For example, 83.33% is higher than 75% (which is three‑quarters) but lower than 90%, giving a quick sense of size.
In everyday situations, you might use this percentage to describe success rates, portions of a recipe, or any scenario where a part of a whole needs to be expressed in a familiar format.