TV on a Rolling Cart

Finding the Start Time Using a Number Line | Elapsed Time (Under 1 Hour)

From Math with Mr. J

Finding the Start Time Using a Number Line | Elapsed Time (Under 1 Hour)
5 min3rdMath
access
YouTube logoFree

Summary

How to find elapsed time -- the time between a start and an end -- using a number line or a clock. Mr. J counts up in easy jumps.

Viewer safety

All ages

Our rating is a quick teacher-to-teacher guide — preview before showing.

Teaching resources

Discussion questions

Elapsed time is how much time has passed; counting up on a number line makes it easy.

  1. What does 'elapsed time' mean?
  2. How can a number line help you count the time between two clocks?
  3. How do you handle crossing an hour?

Quick work-a-long

Words to know: elapsed time, start time, end time, number line

  • Find the elapsed time from 2:15 to 3:45.
  • If a movie starts at 4:30 and lasts 90 minutes, when does it end?