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CPM Course 2 – Chapter 7

Proportions and Percents

In this chapter, students will extend the use of scale factors to describe a multiplicative relationship between quantities and to find unknown quantities.  The themes are proportions and percents.  During this chapter students:

  • Use diagrams to identify equal ratios and scaling relationships (enlarging and reducing)
  • Use the relationships to  solve proportions (not cross products yet)
  • Develop strategies for writing and solving equations with a coefficient that is a fraction.
  • Begin percent increase or decrease as well as simple interest.

Homework help for this chapter is here

Homework help offers tips, strategies and sometimes solutions for every homework question in this chapter.


  • Parent Guide from CPM for this chapter is here
  • Khan academy videos on proportions are here