The fraction 40/51 is equal to 78.43% when converted to a percentage and rounded to two decimal places. This means that if you had 51 items and took 40 of them, you'd have about 78% of the total. It's a bit more than three-quarters but not quite four-fifths of the whole amount.
In everyday situations, you might see this fraction pop up in various contexts. For example, if 40 out of 51 students passed a test, you could say the pass rate was roughly 78%. Or if a basketball player made 40 out of 51 free throws in a season, their free throw percentage would be about 78%. This percentage gives a quick and easy way to understand the proportion represented by the fraction 40/51.