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CPM Course 2 – Chapter 4

Proportions and Expressions

This chapter continues to build the big idea of proportional relationships in the context of real-world situations.  The themes are proportions and expressions.  During this chapter students:

  • Look at similar figures in order to determine how the figures change and make scale drawings.
  • Examine tables, graphs, and situations and use informal strategies to solve proportional situations.
  • Use manipulatives (called “algebra tiles”) and write expressions to represent the perimeter and area of these shapes, building skills like combining like terms and equivalent expressions.

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 expressions are here