Activity Description Practice finding elapsed time given a starting time and an ending time. Elapsed Time is one of the Interactivate assessment explorers.

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Elapsed Time

Place in mathematics curriculum:

This activity can be used to:

• Develop the idea of elapsed time.
• Practice calculating elapsed time between a starting and an ending time.
• Help students to understand number systems other than base ten.
• Help students practice reading a clock.
• Display the purpose of visual representations of data

This activity allows the user to practice determining the elapsed time given a starting time and an ending time. This activity would work well in groups of one to two for about ten to fifteen minutes if you use the record sheet and five minutes otherwise.

Preparations for this activity:

• Explain the connection between the center clock and the beginning and ending times.
• Explain several ways to determine elapsed time.
• Explain how to subtract one time from another.
• Explain that the applet doesn't show AM or PM times specifically but if the beginning time appears to be later than the ending time, then it will be necessary to pass the 12:00 time, hence switching over from AM to PM or PM to AM.