Rounding (Grade 3)

The Rounding Machine teaches rounding of two-digit numbers to the nearest tens.  It illustrates the concept by having a marble roll left for rounding down and right for rounding up.

For third graders.

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Time needed to build the machine and teach the lesson: 45 minutes

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

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