Calculate Elapsed Time
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What you will learn
- 1Calculate elapsed time in hours and minutes
- 2Find start or end time given a duration
Mini Lesson
Elapsed time is the amount of time that passes between a start time and an end time. To find elapsed time, count on from the start time to the end time. You can count hours first, then minutes, or use a number line timeline.
Method: Count On
- Start at the given start time.
- Count on in hours as far as you can without passing the end time.
- Then count on in minutes to reach the exact end time.
- Add the hours and minutes together for the total elapsed time.
Train leaves at 9:30, arrives at 11:00. What is the elapsed time?
Finding Start or End Time
- To find end time: start time + duration = end time.
- To find start time: end time - duration = start time.
- Example: Film ends at 4:30, lasts 1 hour 30 min. Start = 4:30 - 1:30 = 3:00.
Words to know
Elapsed time
The amount of time that passed between a start and end
e.g. From 9:30 to 11:00 the elapsed time is 1 hour 30 minutes.
Start time
When something begins
e.g. My lesson start time is 8:00.
End time
When something finishes
e.g. The end time of the show was 4:15.
Duration
How long something takes
e.g. The movie has a duration of 90 minutes.
Number line
A line that helps you count time forward in jumps
e.g. I used a number line to add 30 minutes.
Use a timeline or number line to visualize elapsed time. Mark the start, count on in hours, then add extra minutes.
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