70/71 as a percentage is 98.59%. This fraction is just a little bit less than a whole, so when you turn it into a percent you get a number that’s very close to 100. It’s a handy way to see how near‑perfect something is.
Because the value is so high, 70/71 often shows up in situations where you want to express a tiny shortfall. For example, if a student gets 70 out of 71 points on a test, they have earned 98.59% of the possible marks, which is an excellent score.
In everyday language we might just round it to “about 99%” when we want a quick estimate, but the exact figure 98.59% tells you precisely how much of the whole you have. It’s a clear illustration of how fractions and percentages represent the same quantity in different forms.