Elapsed Time (Grades 3 & 4)

The Elapsed Time machine teaches students to determine elapsed times ranging from 10 minutes to two hours and 50 minutes.

For third and fourth graders.


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Time needed to build the machine and teach the lesson: 30 minutes

To build this machine in a class of 25 you will need these parts:

  • 8‚ÄĚ x 10‚ÄĚ mat boards, package of 25
  • 25 machine sheets – click here and print them out on a color printer. The sheets are designed to use color ink sparingly.
  • 25¬†medium-sized rubberbands
  • Estimated parts cost: $12

You will also need:

  • Scotch tape – we recommend one roll per five children
  • Scissors for each child

Illustrated, step-by-step assembly instructions & Lesson Plan (one page)   Click here