66/70 as a percentage is 94.29%. This fraction is just a little below a whole, so when you see it written as a percent it looks almost like 100 %. The rounded value of 94.29% gives a clear picture of how close the fraction is to one.
The fraction 66/70 can be simplified to 33/35, but the decimal and percent forms are often more useful in everyday situations. It shows that you have 94.29 out of every 100 parts, which is a handy way to compare it with other percentages.
In practical terms, a result of 94.29% might appear on a test score, a product rating, or a survey result. Knowing the percent makes it easy to understand just how high the value is without having to think about the original numbers.