98.44% is what you get when you turn the fraction 63/64 into a percentage.
This fraction is just a little bit less than a whole, so the percentage is close to 100%. In everyday terms, it means you have 98.44 out of every 100 parts.
Knowing that 63/64 equals 98.44% can be handy in school projects, recipes, or any situation where you need to compare a part to a whole in a clear way.