720/720 = 100%
A fraction like 720/720 represents a complete amount, or 100%. It could show up when all 720 seats in a theater are filled, every item in a shipment arrives, or a student finishes all 720 questions in an assignment.
You can picture it as one whole circle shaded in, with no part left empty. Since the top and bottom numbers are the same, you can quickly estimate that the value is the entire amount rather than a small portion.
A common mistake is thinking that large numbers automatically make a fraction large. In this case, the matching numbers show that the fraction is complete, while a fraction such as 720/1,000 would represent less than the whole.