415/415 = 100%
A fraction like 415/415 shows up when all 415 items in a group are accounted for or completed. For example, a student might finish every question on an assignment, or a store might sell all the items it had in stock.
You can picture it as one whole circle, a completely filled progress bar, or a full container. Since the top and bottom numbers are the same, the value is exactly 100%, not just close to it.
A common mistake is thinking that a large denominator automatically makes the fraction small. In this case, the numerator is equally large, so the fraction still represents the entire amount.