Lesson plan

Understand that angles are additive by decomposing and composing

teaches Common Core State Standards CCSS.Math.Content.4.MD.C.7 http://corestandards.org/Math/Content/4/MD/C/7
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: Angles can be decomposed into smaller parts. Angles can be added together to create a larger angle. This lesson builds on students' knowledge of decomposing angles and benchmark angles. The task asks students to take a benchmark angle (like 360°) and break it into various smaller angles. Through an exploration of pattern blocks, students will see that a benchmark angle can be broken down into smaller parts and those smaller parts can be added together to recreate the same benchmark angle, leading students to an understanding that angles are additive. Their work decomposing and composing angles builds towards students' future work in solving for unknown angles using an equation. Vocabulary: additive, benchmark angle, central angle, central point, common vertex, decompose Special Materials: pattern blocks