In this unit students use algebraic expressions to represent variable situations while learning how to combine use the distributive property and factor by reversing distribution.

- CME, Discovering Algebra, and Dan Meyer’s Number Tricks are good for building expressions, as well as understanding why we combine like terms.
- Park Math’s Defining New Symbols for evaluating expressions
- The Banana Rule could be the basis for an activity where students seek out structure in complex or tricky expressions.
- Factoring by un-distributing can be taught early, and area models can help.
- The process of Guess-Check-Generalize is a powerful habit of mind that helps students translate contexts to expressions.

**Still Need:**

- Some interesting problems that hit combining like terms. The number tricks hit these at a basic level.

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