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These are the "Investigations" completed at the beginning of each lesson.
WU #1: Simplifying Algebraic Expressions (CLT): download
WU #2: Adding and Subtracting Algebraic Expressions (using Algebra Tiles): download
WU #3: Using Models to Write Algebraic Expressions then Simplifying (Dist. & CLT): download
WU #4: Factoring Algebraic Expression using Models: download