Solve problems involving duration, including using 12- and 24-hour time within a single time zone (ACMMG199)

LO:To solve problems involving duration


  • what are the units of time
  • what the sequential order of time
  • how to calculate elapsed time
  • 12-hour and 24-hour time
  • how to read the time in an analog clock


  • that time progresses in a logical fashion.


  • I can solve problems involving duration and elapsed time..

Calculating Elapsed time

The easiest way to calculate elapsed time is to look at 2 time periods.

  • starting time
  • finishing time

An easy way to calculate elapsed time is to use a timeline.

If you use the hopping method it should help you calculate the duration of tasks.

  • hop the hours first
  • then hop the minutes
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