Lesson plan

Model subtraction of positive integers 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.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: Integers can be used to describe real-world contexts and can be subtracted. The subtraction of integers can be modeled 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 the subtraction of positive integers with an equation and on the number line. Students are provided with the high, low, and/or decreases in temperature for several cities and are asked to find the third value when the other two are provided. It is building the idea of modeling subtraction of integers on the number line and building toward a conceptual understanding that these models may be used when any two of the three subtraction values (minuend, subtrahend and difference) are known. Vocabulary: decrease, equation, minuend, subtrahend, difference Special Materials: Number line