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After years or doing this by hand on the whiteboard, I decided to make a visual that was not only concrete and color coded, but something that my students could continually use as a reference throughout the year when we needed a review.
After this lesson, I always notice a HUGE difference in my students ability to...
I start off my breaking down how to represent a time problem on number line (start time left, end time right, elapsed time with hops and labels).
-Word problem with start and end time provided (finding elapsed time)
-Word problem with start and elapsed time provided (finding end time)
-Word problem with end time and elapsed time provided (finding start time)
At the end I provide the students with practice problems.