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Grade 3/Word Problems

Time Word Problems: Half-Hour Intervals

Read and compute time or elapsed time at half-hour and 5-minute intervals. No crossing midnight.
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Practice Questions

  1. A show starts at 2:30 p.m. It lasts 30 minutes. What time does it end?
    Show answer

    2:30 p.m. + 30 min = 3:00 p.m. It ends at 3:00 p.m.

  2. Class begins at 11:15 a.m. It lasts 15 minutes. What time does it end?
    Show answer

    11:15 a.m. + 15 min = 11:30 a.m. It ends at 11:30 a.m.

  3. Breakfast is at 7:05 a.m. It takes 10 minutes. What time is it when you finish?
    Show answer

    7:05 a.m. + 10 min = 7:15 a.m. It is 7:15 a.m.

  4. Recess ends at 9:40 a.m. It started 10 minutes earlier. What time did it start?
    Show answer

    9:40 a.m. − 10 min = 9:30 a.m. It started at 9:30 a.m.

  5. Music starts at 1:55 p.m. It lasts 5 minutes. What time does it end?
    Show answer

    1:55 p.m. + 5 min = 2:00 p.m. It ends at 2:00 p.m.

Quick Tip
Use 5/10/15/30-minute intervals. Show a.m./p.m. when given. Do not cross midnight.
Teacher Resources
Lesson Plan

Time Intervals and Word Problems

Standards
2.MD.C.7
Printable Aids
Clock FaceTimeline
Teaching Notes

Use number lines or T-charts to visualize time changes. Reinforce understanding of half-past times with analog and digital clocks.

Vocabulary
Half-hour: A period of 30 minutes.
Interval: The amount of time between two events.
Common Mistakes
  • Confusing 'half past' with 'half to' the next hour.
  • Incorrectly adding/subtracting minutes when crossing the hour (e.g., 2:30 + 30 min = 2:60).
  • Misreading the minute hand for 30 minutes on an analog clock.
Differentiation
SupportUse a physical clock to model time changes.
ChallengeIntroduce multi-step problems or AM/PM concepts.
Discussion Questions
  • How is half-past an hour different from on-the-hour?
  • What tools help us add or subtract time intervals?
  • When do you use half-hour times in your daily life?
  • How do you know if it's exactly 30 minutes past an hour?
Extension Activities
  • Calculate elapsed time.
  • Use a digital clock.
  • Add quarter-hour intervals.
Parent Tip

Use a clock to practice adding 30 minutes to different times.

Learning Path
Skill Cluster

Time & Measurement

Grade Level

2-3

Skills Practiced
Telling timeAdding 30 minutesTime intervals