Lesson plan

Understand subtraction as adding the additive inverse by modeling with number lines

teaches Common Core State Standards CCSS.Math.Content.7.NS.A.1c http://corestandards.org/Math/Content/7/NS/A/1/c
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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Big Ideas: Any subtraction problem can be solved by adding the additive inverse, or opposite value. a - b = a + -b This lesson builds on students' previous work with positive and negative integers and understanding integers in context in sixth grade. The task asks students to represent word problems with both addition and subtraction equations and number lines. Students are provided with the context of students comparing homework answers and are asked to show the student work described. The lesson uses the visual model of the number line to build the concept that any subtraction problem can also be solved by adding the inverse. Vocabulary: additive inverse Special Materials: none