# 6. Cookie Conundrum: Solve multi-step equations with rational numbers (A)

teaches Common Core State Standards CCSS.Math.Content.7.EE.B.4 http://corestandards.org/Math/Content/7/EE/B/4
teaches Common Core State Standards CCSS.Math.Content.7.EE.B.4a http://corestandards.org/Math/Content/7/EE/B/4/a
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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Lesson objective:  Apply solving multi-step equations to a real-world scenario.

This lesson provides an opportunity for students to apply their knowledge and understanding of solving equations to a real-life situation. Students are asked to construct an equation to model a fundraising scenario and then solve for how much money each person made from selling cookies.

Key Concept students will use:

• Equivalent equations have the same solution, and properties of equality allow us to transform equations into other equivalent equations.

Skills students will use:

• Solving equations using the same operation on both sides.
• Simplifying expressions using properties of operations.

Students engage in Mathematical Practice 4 (Model with mathematics) as they write and solve an equation to model the total amount raised for the club.

Key vocabulary:

• equivalent equation
• like terms
• solve

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