84/85 as a percentage is 98.82%. This number shows just how close the fraction is to a whole. When you see a value that high, it means the fraction is only a tiny bit less than 100%.
The fraction 84/85 can be thought of as 84 parts out of a total of 85 equal parts. Because there is only one part missing, the result is very close to a complete set. That’s why the percentage is almost 99%.
In everyday use, you might round 98.82% to 99% when you need a quick estimate. Still, the exact rounded figure gives a precise picture of how large the fraction really is.