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Lesson · Grade 5 · Mathematics

How Long Is the Movie? Counting On to Find Elapsed Time

  • Grade 5
  • Mathematics
  • 1 min 11 s
  • British Columbia
  • BC5-MA-29

A movie runs from 2:45 to 4:10, and the video finds how long it lasts by counting on along a timeline: 15 minutes to 3:00, 1 hour to 4:00, then 10 minutes to 4:10. Adding the jumps gives 1 hour 25 minutes, and counting on 1 hour and then 25 minutes from 2:45 lands on 4:10 to check the answer.

Concept: Elapsed time: how long from start to finish

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In one sentence

The question this lesson answers

A movie starts at 2:45 and ends at 4:10.

How long is the movie?

Transcript

What the lesson says

A movie starts at 2:45 and ends at 4:10.

How long is the movie?

Put both times on a timeline.

The time from start to finish is called the elapsed time.

First, count on from 2:45 to the next hour, 3:00.

That jump is 15 minutes, since 45 plus 15 is 60.

Next, jump a whole hour, from 3:00 to 4:00.

Last, count on from 4:00 to 4:10, which is 10 minutes.

Now add the three jumps.

15 minutes plus 10 minutes is 25 minutes.

So the movie is 1 hour and 25 minutes long.

To check, 1 hour after 2:45 is 3:45.

Then 25 minutes after 3:45 is 4:10, the end time.

To find elapsed time, jump to the next hour, then the whole hours, then the minutes.

Curriculum

Where this fits

British Columbia, Grade 5

Mathematics, Geometry and measurement: duration, using measurement of timeBC5-MA-29

Previous: Same Perimeter, Different AreasNext: Prisms and pyramids: name it by its base

The outcomes and strands follow the British Columbia curriculum.

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