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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.

#### Practice/Activities/Games

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