Lesson plan

3. Using substituting and evaluating in real world problems (A)

teaches Common Core State Standards CCSS.Math.Content.6.EE.B.5 http://corestandards.org/Math/Content/6/EE/B/5
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
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Lesson objective: Apply understanding of substituting values in for variables and evaluting an inequality in order to solve real-world problems.

This lesson provides an opportunity for students to apply their knowledge and understanding of substituting values for variables and evaluating an inequality to a real-life situation. Students are asked to help Mr. Lee decide how much pizza, juice and cookies he should get for a class party and stay within a budget.  

Key Concept students will use: 

  • The solution of an equation is the set of values that makes the equation true.

Skills students will use:

  • Evaluating values in an equation to determine if the set of values makes the equation true 
  • Identifying equivalent expressions (Grade 6, Unit 8)
  • Appling properties of operations to algebraic expressions just as they did to numerical expressions (Grade 6, Unit 8)

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as they determine the amount of pizza, juice and cookies Mr. Lee can buy using substitution and evaluating equations. 

Key vocabulary: 

  • equation
  • evaluate 
  • expression
  • solution
  • substitute
  • value