Lesson plan

15. Graph inequalities on number lines (FP)

teaches Common Core State Standards CCSS.Math.Content.6.EE.B.8 http://corestandards.org/Math/Content/6/EE/B/8
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7
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Lesson objective: Graph inequalities on a number line using word problems and inequalities.

This lesson helps to build the procedural skill of identifying inequality words with their corresponding number line graphs. A number line is used here because it provides an excellent visual representation of the solutions to an inequality. This work develops students' understanding that, just like equations, the solutions to inequalities can be represented on number lines.

Students engage in Mathematical Practice 2 (Reason abstractly and quantitatively) as they analyze each situation, inequality, or graph to find or write the matching representation.

Key vocabulary:

  • closed circle
  • inequality
  • number line
  • open circle
  • ray