9/21 expressed as a percentage is 42.86%. This is the same value you would see when you convert the fraction to a percent and round to two decimal places.
The fraction 9/21 can be reduced by dividing both numbers by their greatest common divisor, which is 3. After simplification, it becomes 3/7. Even in its reduced form, the fraction still represents the same portion of a whole.
In everyday situations, you might see 42.86% used to describe a share of a group, a discount, or a test score. Knowing both the fraction and its percent form helps you understand and communicate the size of a part in different ways.
