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Find elapsed time in whole hours

Elapsed time in whole hours is the number of one-hour intervals between a starting time and an ending time, found by tracking the hour hand or counting forward on a clock or timeline. This understanding involves interpreting exact-hour times on a 12-hour clock and determining a missing start time, end time, or duration within the same day; fractional hours, minutes, 24-hour notation, and multi-day intervals are not included.

Detailed Explanation: Find elapsed time in whole hours

To find elapsed time in whole hours, count how many one-hour jumps it takes to get from the starting time to the ending time.

Example: A movie starts at 3:003{:}00 and ends at 7:007{:}00. How long is the movie?

  1. Start at 3:003{:}00.
  2. Count forward one hour at a time:
    • 3:003{:}00 to 4:004{:}00 = 1 hour
    • 4:004{:}00 to 5:005{:}00 = 2 hours
    • 5:005{:}00 to 6:006{:}00 = 3 hours
    • 6:006{:}00 to 7:007{:}00 = 4 hours
  3. The elapsed time is the number of jumps.
4 hours\boxed{4\text{ hours}}

So, the movie lasts 4 hours.

Learn by doing: Find elapsed time in whole hours

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    Time - Elapsed - Two Clocks To Hours & Minutes - Full Hours

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