Calculate a sleep opportunity across midnight

Supplied materials

• Paper or a text document; all cases below are original fictional learning inputs.
• An adult may read aloud; drawing or spoken answers are valid. No personal health information or physical performance is required.
• The separate worked case gives bedtime 24 h=19, wakeHour=6. Count hours to midnight, then add morning hours. First identify the quantities and keep their units consistent. The calculation is 24-19+6=11 hours opportunity. That result answers this supplied planning question only. It does not establish what a real person did, diagnose a condition or prove physical skill. Compare the units with the question before accepting a number.
• Fictional case 1: bedtime 24 h=21, wakeHour=7. What is the modeled result using the stated method?
• Fictional case 2: bedtime 24 h=20, wakeHour=6. What is the modeled result using the stated method?
• Fictional case 3: bedtime 24 h=22, wakeHour=7. What is the modeled result using the stated method?
• Fictional case 4: bedtime 24 h=21, wakeHour=6. What is the modeled result using the stated method?
• Fictional case 5: bedtime 24 h=20, wakeHour=7. What is the modeled result using the stated method?
• Fictional case 6: bedtime 24 h=22, wakeHour=6. What is the modeled result using the stated method?

Learn the idea

Children ages six to twelve generally need nine to twelve hours of sleep per day. A paper schedule can reserve a window, but a window is not a measurement of actual sleep. This lesson uses a fictional eleven-year-old.

Represent evening bedtime on a 24 hour clock and next-morning wake time on the same scale. Hours to midnight are 24 minus bedtime; add wake time. This prevents incorrectly subtracting 7 from 21 as if the events occurred on the same day.

Use invented times only. A result below the general age range indicates a planning gap in this model, not a diagnosis. Actual sleep concerns belong with a caregiver and qualified professional, and no medication or supplement planning is part of this task.

1. Read or listen to the pretend story. Point to the details the question gives you.
2. Use the 24-hour bedtime: subtract it from 24, then add the next-morning wake hour. Name the result as a sleep opportunity, not measured sleep.
3. Check your answer against the example. Say what matches and what you would change.
4. Try the practice questions, then the extra task. Drawing or spoken answers are welcome.

Check your reasoning

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Take it further

Changed case: bedtime 24 h=20, wakeHour=8. Show the operation. Expected: 24-20+8=12 hours opportunity. Explain what the unit means and remember that this is a pretend calculation.

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