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Lesson Plan

Understand sums may be greater than, less than or in between its addends by using visual models

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.Content.7.NS.A.1d http://corestandards.org/Math/Content/7/NS/A/1/d
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
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8
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Big Ideas: A sum may be less than, equal to, or greater than its addends. This lesson builds on students' previous work with addition and understanding integers in context in sixth grade. The task asks students to critique the reasoning of others, justify their thinking, and develop an understanding that sums may be less than, greater than, or equal to its addends. Students are provided with a common misconception; addition always means more and results in a larger number. They are asked to critique this argument and make generalizations about the relationships between addends and resulting sums. The lesson models addition of integers using counters and builds an understanding that sums may be bigger, smaller, or equal to its addends. Vocabulary: addend, sum, greater than, less than, in between Special Materials: Two color counters or number lines
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