Group Activity Cards
Numbers
and Operations
Use groups of 2.
Materials: Metric rulers

Teacher, I Shrunk the Students

Suppose that you and your partner are in charge of building the props for a play about mathematics students who have accidentally been shrunk. The designer of the production has determined that the ratio of realworld objects to props should be 3:10.
Props must be made for the following realworld objects.
 your math book
 a ruler
 an index card
Determine the length and width in centimeters of each of these three props by using proportions.
