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Elapsed Time

Find how much time has passed between a start and end time, including crossing the hour.
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Prerequisites
⏰ Mixed Time Units6 WS
2 min = ____ sec

Practice Questions

  1. Start: 2:00 PM, End: 4:30 PM
    Show answer

    2 hr 30 min

  2. Start: 9:00 AM, End: 11:15 AM
    Show answer

    2 hr 15 min

  3. Start: 1:30 PM, End: 5:00 PM
    Show answer

    3 hr 30 min

  4. Start: 8:00 AM, End: 3:00 PM
    Show answer

    7 hr

  5. Start: 10:45 AM, End: 1:15 PM
    Show answer

    2 hr 30 min

Quick Tip
Subtract the start time from the end time.
Teacher Resources
Teaching Notes

This collection focuses on elapsed time. Ensure students understand the relationship between seconds, minutes, hours, and days.

Vocabulary
Elapsed Time: The amount of time that has passed.
Start Time: The time when an event begins.
End Time: The time when an event finishes.
Common Mistakes
  • Confusing the conversion factors (60 vs 24)
  • Multiplying instead of dividing
  • Forgetting to label units
  • Miscalculating elapsed time across AM/PM boundaries
  • Subtracting minutes like base 10.
  • Forgetting to borrow from hours.
  • Miscalculating across midnight.
  • Confusing AM/PM.
Differentiation
SupportProvide a clock or timeline. Use real-world examples like class schedule.
ChallengeChallenge students to convert across multiple steps or calculate elapsed time with more complex intervals.
Discussion Questions
  • Why are there 60 minutes in an hour?
  • How do you calculate time difference?
  • When would you use seconds instead of minutes?
  • How does a number line help visualize time?
  • When is calculating elapsed time useful in daily life?
  • What strategy do you use when the end time is on the next day?
  • How can you check if your elapsed time answer is correct?
Extension Activities
  • Create a daily schedule.
  • Time activities in the classroom.
  • Calculate the duration of a movie or event.
Parent Tip

Ask your child to calculate the time until dinner.

Learning Path
Skill Cluster

Measurement and Data

Estimated Time

15 minutes

Skills Practiced
Elapsed time