This lesson, although it appears simple, is quite challenging. Many students will easily calculate the number of Cheerios representing the diameter of their planet, but then have difficulty making the visual model.

*It is important that the teacher demonstrate to the students that the Cheerios should represent the diameter - and that means when they draw their planets around their Cheerios, there should not be any space between the lines that they are drawing and the Cheerios. (Please see How to assess your students' end products)

Any space means that the students are not truly showing an accurate representation of their planet. If they can fit Cheerios inside their planet (where the diameter is located), this is incorrect.

The assessment of this activity is:

- Students have accurately calculated the number of Cheerios representing thier planets diameter and
- There are no spaces on the interior of their planet (where the diameter is represented by Cheerios).