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# 2. Practicing substituting and evaluating (FP)

teaches Common Core State Standards CCSS.Math.Content.6.EE.B.6 http://corestandards.org/Math/Content/6/EE/B/6
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2

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Lesson objective: Fluently substitute and evaluate numbers in the specified set to determine which number makes the equation true.

This lesson helps to build fluency with substituting numbers in for variables in an equation and evaluating the equation to determine if the number makes the equation true.  Tape diagrams and number lines can be used here because they support how to evaluate equations. This work develops students' understanding that the solution of an equation is the set of values that make the equation true.

Students engage in Mathematical Practice 2 (Reason abstractly and quantitatively) as they substitute values in for the variable and evaluate each equation to determine which value makes the equation true.

Key vocabulary:

• equation
• evaluate
• solution
• substitute
• variable

Special materials needed:

• none
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