Calculate Elapsed Time Across Several Hours

Supplied materials

• Paper and a pencil; drawing and spoken explanations are welcome. An adult may read directions and options aloud.
• Supplied worked-case record: On one afternoon, 1:35 to 4:10 lasts twenty-five minutes to 2:00, two full hours to 4:00, and ten more minutes.
• All quantities and shape descriptions are supplied in the worked example and questions; no purchase or personal information is needed.

Learn the idea

For intervals spanning several hours, split at whole-hour landmarks. Add the first partial hour, any full hours, and the final partial hour. Each full hour contributes sixty minutes. The same-day context prevents a twelve-hour clock label from leaving the date or direction ambiguous.

Read the stated same-day start and finish. Jump to the next hour, count full hours, then add the minutes to the finish. Verify by adding the duration to the start using sixty-minute hour boundaries.

Count complete hours separately from partial-hour minutes. Hour labels use a sixty-minute cycle, not one hundred minutes. Draw a timeline with every whole-hour stop shown.

1. Draw a timeline with every whole-hour stop shown.
2. Follow the worked example. Point to each number or shape feature and say what it tells you.
3. Read the stated same-day start and finish.
4. Try the question and then the three practice questions. Check your answers and explain any change you make.

Check your reasoning

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Take it further

Same morning 8:45 to 11:20 lasts 155 minutes.

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