Telling time is a practical math skill used every day for school schedules, appointments, travel, cooking, and sports. Clocks help us measure when events happen and how long they last. An analog clock shows time with moving hands on a numbered circle, while a digital clock shows the time using numbers.
Learning both forms helps you read time in many real situations.
Key Facts
- 1 hour = 60 minutes
- 1 minute = 60 seconds
- On an analog clock, the short hand shows the hour and the long hand shows the minutes.
- Each number on an analog clock represents 5 minutes for the minute hand.
- Elapsed time = ending time - starting time
- AM runs from midnight to before noon, and PM runs from noon to before midnight.
Vocabulary
- Analog clock
- A clock that shows time using hands that move around a numbered circle.
- Digital clock
- A clock that shows time with numbers, usually in hour:minute form.
- Hour hand
- The shorter hand on an analog clock that points to the hour or between two hours.
- Minute hand
- The longer hand on an analog clock that points to the number of minutes after the hour.
- Elapsed time
- The amount of time that passes between a starting time and an ending time.
Common Mistakes to Avoid
- Reading the hour hand as the minute hand is wrong because the shorter hand shows the hour and the longer hand shows minutes.
- Counting each clock number as 1 minute is wrong because each number represents 5 minutes for the minute hand.
- Ignoring whether a time is AM or PM is wrong because 7:00 AM and 7:00 PM happen at different parts of the day.
- Subtracting times without borrowing 60 minutes is wrong because time is based on 60 minutes per hour, not 100 minutes per hour.
Practice Questions
- 1 An analog clock has the hour hand just past 3 and the minute hand on the 4. What time is it?
- 2 A movie starts at 6:35 PM and ends at 8:10 PM. How much elapsed time has passed?
- 3 Explain why the hour hand is between 9 and 10 when the time is 9:45, instead of pointing exactly at 9.