63.75% is what you get when you turn the fraction 51/80 into a percentage. This number tells you how much of a whole 51 parts out of 80 represent, and it’s rounded to two decimal places for easy reading.
The fraction 51/80 is a little more than half, because 40/80 would be exactly 50%. Adding another 11 parts (making it 51) pushes the value past the halfway mark, which shows up as a little over 60% when expressed as a percentage.
In everyday situations, you might see this kind of percentage on a test score, a discount, or a survey result. Knowing that 63.75% means “just under two‑thirds” can help you quickly understand the size of the portion being discussed.