Lesson plan

# 5. Extend understanding of opposites as points reflected across the x or y axis. (FP)

teaches Common Core State Standards CCSS.Math.Content.6.NS.C.6b http://corestandards.org/Math/Content/6/NS/C/6/b
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Lesson objective: Fluently extend understanding of opposites as points reflect across the x or y axis.

This lesson helps to build fluency with recognizing coordinate pairs that are reflections across the x or y axis and with naming a reflection of a point across a given axis. The coordinate plane is used here because it allows students to physically see given points reflected across the x or y axes. This work develops students' understanding that points (a, b) and (-a,b) are reflections about the y-axis and (a,b) and (a,-b) are reflections about the x-axis.

Students engage in Mathematical Practice 7 (look for and make use of structure) as they apply their knowledge of the coordinate plane, coordinate pairs and opposites to reflect points across the x and y axes.

Key vocabulary:

• reflection
• x-axis
• y-axis

Special materials needed:

• scrap blank coordinate planes