The fraction 90/100 is equal to 90.00% when expressed as a percentage. This means that 90 out of every 100 parts or units are being considered. It's a common way to represent a large portion of something, just shy of being the whole amount.
In everyday life, you might see this percentage used in various contexts. For example, a student scoring 90/100 on a test would have achieved 90% of the possible points. Similarly, if 90 out of 100 people prefer a certain product, it could be said that 90% of the group likes it. This fraction and its percentage equivalent are often used to show high levels of completion, satisfaction, or achievement in many fields.