Lesson plan

# 9. Practice using "rules" for operating with positive and negative numbers (FP)

teaches Common Core State Standards CCSS.Math.Content.7.NS.A.1 http://corestandards.org/Math/Content/7/NS/A/1
teaches Common Core State Standards CCSS.Math.Content.7.NS.A.1d http://corestandards.org/Math/Content/7/NS/A/1/d
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1

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Lesson objective: Fluently use the rules for adding and subtracting rational numbers.

This lesson helps to build fluency with adding subtracting rational numbers. Equations are used here because they support students' understanding of how to interpret the operations being used. This work develops students' understanding that rules can be derived from adding and subtracting rational numbers.

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as they seek to determine which rules apply to the given equations in order to calculate the accurate solution.

Key vocabulary:

• equation
• positive
• negative
• rational
• sign
• symbol