1242/1242 = 100%
A fraction like 1242/1242 shows up when something is completely finished or fully accounted for. For example, if all 1,242 tickets for an event are sold, the event has reached 100% of its sales goal.
You can picture it as one whole circle, a full glass, or a progress bar filled from edge to edge. Since the top and bottom numbers are the same, it represents the entire amount rather than just part of it.
A common mistake is thinking that a large denominator makes the fraction less than a whole. In this case, both numbers describe the same total, so the fraction means everything is included.