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Year 3 · Time

Elapsed time

Elapsed time is how long something lasts, from start to finish.

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How to do it

  1. Count on from the start time to the next whole hour.
  2. Count whole hours.
  3. Count the last minutes. Add them all.

Worked example

9:45 to 11:15
9:45 → 10:00 is 15 min. 10:00 → 11:00 is 1 h. 11:00 → 11:15 is 15 min.
1 h 30 min

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Watch out
An hour has 60 minutes, not 100.

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