45/80 is 56.25%. This is the percentage you get when you look at the fraction as a part of a whole, rounded to two decimal places.
The fraction 45/80 can be reduced to 9/16, which still represents the same portion of a whole. Seeing it as a percentage makes it easier to compare with other values that are already expressed in percent form.
Percentages like 56.25% are useful in everyday situations—like figuring out test scores, discounts, or the portion of a recipe you need. Knowing the percent version of a fraction helps you quickly understand its size relative to 100.
