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Lesson Plan

Model subtraction of negatives on the number line

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.Practice.MP3 http://corestandards.org/Math/Practice/MP3
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7
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Big Ideas: Subtraction can be shown as movement to the right or left on the number line. This lesson builds on students' previous work with locating positive and negative integers on the number line and understanding integers in context in sixth grade. The task asks students to represent subtraction of negative integers on the number line and to look for patterns in the results. Students are provided with the context of removing a negative score and asked to write an equation and use the number line to model the movement. The task builds on the idea of modeling subtraction of integers on the number line and building toward a conceptual understanding that subtraction can be modeled as both movement to the left (when subtracting a positive) and movement to the right (when subtracting a negative) Vocabulary: integer, positive, negative, subtrahend Special Materials: Number lines
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