Lesson plan

Measure angles by exploring the properties of protractors

teaches Common Core State Standards CCSS.Math.Content.4.MD.C.6 http://corestandards.org/Math/Content/4/MD/C/6
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6

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Big Ideas: Angles are measured using a tool called a protractor. A protractor can measure the arc of an angle using units called degrees. Building on previous knowledge of the properties of angles, this lesson introduces the protractor as a tool to measure angles and degrees as the standard unit of angle measurement. Students have discovered the need for standard form measurement when working with angles and will explore the various ways to measure geometric figures. This lesson will prepare students for measuring and sketching angles using protractors. Vocabulary: protractor, degree, arc Special Materials: rulers, protractors