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Running Head: CROSS-DISCIPLINARY UNIT NARRATIVE1Cross-Disciplinary Unit NarrativeAlexander S. Lloyd Grand Canyon University: SEC 540 March 28, 2019
Running Head: CROSS-DISCIPLINARY UNIT NARRATIVE2Unit Description and Rationale In middle school, students applied the properties of operations to add, subtract, factor, and expand expressions. Students use the structure of expressions to define what it means for two algebraic expressions to be equivalent. In doing so, they discern that the commutative, associative, and distributive properties help link each of the expressions in the collection together, even if the expressions look very different themselves (A-SSE.2). They learn the definition of a polynomial expression and build fluency in identifying and generating polynomialexpressions as well as adding, subtracting, and multiplying polynomial expressions (A-APR.1). students develop a precise understanding of what it means for expressions to be algebraically equivalent.By exploring geometric representations of the distributive, associative, and commutativeproperties for positive whole numbers and variable expressions assumed to represent positive whole numbers, students confirm their understanding of these properties and expand them to apply to all real numbers. Students use the properties to generate equivalent expressions and formalize that two algebraic expressions are equivalent if we can convert one expression into the

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