12/35 expressed as a percentage is 34.29%. This rounded figure gives a quick sense of how large the fraction is compared to a whole.
The fraction 12/35 is a little more than one third (since 1/3 is about 33.33%). It shows that for every 35 equal parts, 12 of them are being considered. In everyday terms, you could think of it as taking 12 slices out of a pizza cut into 35 slices.
Knowing the percentage makes it easier to compare with other values. For example, a test score of 34.29% would be just below the halfway mark, and a discount of that size would be noticeable but not huge. Using both the fraction and the percentage helps you communicate the size of a part in the way your audience prefers.
