36/70 as a percentage is 51.43%. This number tells you that the fraction is just over half of a whole.
The fraction 36/70 can be reduced to 18/35, but the value stays the same. Whether you write it as 36/70, 18/35, or 51.43%, you are describing the same proportion.
Seeing the percentage makes it easy to compare with other numbers. For example, if a test score is 51.43% and another score is 60%, you can quickly see the second score is higher.
In everyday situations, using the percentage form helps people understand parts of a whole without having to work with fractions. It’s a clear and simple way to communicate the size of the part.