Lesson plan

10. Solving two-step word problems using more than one variable (A)

teaches Common Core State Standards CCSS.Math.Content.3.OA.D.8 http://corestandards.org/Math/Content/3/OA/D/8
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
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Lesson objective: Solve two-step word problems including more than one variable. 

This lesson provides an opportunity for students to apply their knowledge and understanding of using a variable to represent an unknown quantity to a real-life situation. Students are asked to figure out the cost of two different wristbands for a waterpark. They are givent the total cost for the two wristbands and lunch, but they are only given the cost of lunch. They also know that one wristband costs twice as much as the other. 

Key Concept students will use: 

  • You can represent unknown quantities in equations using letters.

Skills students will use:

  • Ability to solve two-step word problems.
  • Ability to use a variable to represent an unknown quantity. 
  • Ability to sovle all four types of computation

Students engage in Mathematical Practice 2 (Reason abstractly and quantitatively) as they create logical representations of the problem at hand including a variable for the unknown quantity.

Key vocabulary:

  • equation
  • unknown quantity
  • variable