60/70 as a percentage is 85.71%. This is the rounded value you get when you express the fraction as a part of 100.
The fraction 60/70 can be simplified to 6/7, which is a common ratio in many everyday situations. Even without doing any math, you can recognize that it’s a little less than one whole, so the percentage will be a bit under 100%.
Knowing that 85.71% represents the same amount helps when you compare grades, discounts, or any data that’s shown in percentages. It lets you see at a glance how close the value is to a full 100%.