Lesson Plan

The Number Line Extended


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Big Ideas




Students will learn about negative numbers and how negative numbers can be considered an extension of the positive number line. Students will:

  • learn about the extended number line for all integers.
  • use the number line to locate negative and positive numbers.
  • identify real-world situations that can be modeled by negative numbers.

Essential Questions

  • How is mathematics used to quantify, compare, represent, and model numbers?
  • How can mathematics support effective communication?
  • How are relationships represented mathematically?
  • How can expressions, equations and inequalities be used to quantify, solve, model, and/or analyze mathematical situations?
  • What makes a tool and/or strategy appropriate for a given task?


  • Integer: A real number that does not include a fractional part.
  • Negative Number: A number with a value less than zero.
  • Positive Number: A number with a value greater than zero.


90–120 minutes

Prerequisite Skills


Related Unit and Lesson Plans

Related Materials & Resources

The possible inclusion of commercial websites below is not an implied endorsement of their products, which are not free, and are not required for this lesson plan.

  • Use the following Web site for finding negative temperatures to share with the class: www.weather.com
  • The following Web site features a number line game: http://www.funbrain.com/linejump/
  • Topics in Algebra 1 App for TI-83 Plus and TI-84 Plus Families: An application that is preloaded or can be downloaded to explore number sense


  • Classroom materials and student worksheets using the Topics in Algebra 1 App PDF downloadable worksheets (Activities What’s My Sign? or Integer Smash)



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