Lesson plan

Understand opposite quantities combine to make zero by using zero pairs

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.1a http://corestandards.org/Math/Content/7/NS/A/1/a
teaches Common Core State Standards CCSS.Math.Content.7.NS.A.1b http://corestandards.org/Math/Content/7/NS/A/1/b
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: Opposite quantities combine to make zero. 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 the addition of positive and negative integers using visual models and to notice how an equal positive and negative value combine to make zero. Students are provided with the context of ions and asked to find the charge when provided with the number or protons and electrons. It is building the idea of modeling addition of integers and building toward a conceptual understanding that opposites combine to make zero, or zero pairs. Vocabulary: positive, negative, zero, zero pairs Special Materials: 2 colored counters