Elapsed time is the amount of time that has passed between a start time and an end time. To find elapsed time within the hour, count forward from the start time to the end time using 5-minute intervals or minutes.
Use a timeline or clock to model counting forward. Start with simple intervals (5 or 10 minutes), then progress to more complex times. Connect to daily activities ('We started at 10 o'clock and finished at 10:20, so we spent 20 minutes').
You already know how to read a clock to the nearest five minutes — skills like "it's 10:15" or "it's 2:45." Elapsed time asks a different question: not "what time is it?" but "how much time has passed?" It's the distance between two clock readings, just like measuring the distance between two points on a ruler.
The most reliable strategy is to count forward from the start time to the end time using the five-minute intervals you already know. Say a movie starts at 1:10 and ends at 1:40. Start at 1:10 and count up in fives: 1:15, 1:20, 1:25, 1:30, 1:35, 1:40. That's six jumps of 5 minutes each — 30 minutes of elapsed time. Drawing a timeline with tick marks for each five-minute step makes this counting visible and reduces errors.
A helpful real-world anchor: think about how you already sense elapsed time in daily life. "Lunch starts at 11:30 and ends at 12:00 — that's 30 minutes." When you count forward on the clock, you're doing the same thing your brain does naturally, just more precisely. Always ask yourself: "Am I moving forward in time from start to end?" — because that's the direction of counting. Going backward is the most common mistake.
At this level, the start and end times stay within the same hour (for example, both between 3:00 and 4:00), so you never have to worry about crossing the hour boundary. That comes later. For now, practice by choosing a start time, picking an end time within the same hour, and counting the five-minute jumps between them. The more you practice, the more natural it becomes to "see" elapsed time on a clock face.