58/75 as a percentage is 77.33%. This tells you that the fraction is a little less than four‑fifths of a whole, or about three‑quarters when you think in everyday terms.
When you score 58 points out of a possible 75, you have earned 77.33% of the total. Seeing the result as a percentage makes it easy to compare with other scores that might be out of a different total.
Just keep in mind that the number is rounded to two decimal places. For most practical purposes, 77.33% is a clear and useful way to express the value of 58/75.