When you look at the fraction 70/77, it works out to 90.91%. This rounded figure gives you a quick sense of how large the fraction is compared to a whole.
The fraction 70/77 is a simple ratio that can be reduced only a little, because 70 and 77 share a common factor of 7. After dividing both numbers by 7, you get 10/11, which is still close to 1. That closeness shows why the percentage is high—just under 100%.
You might see this kind of fraction when comparing parts to a whole, such as in test scores, success rates, or ingredient mixes. Knowing that 70/77 equals 90.91% helps you understand the result without having to do the math each time.