Lesson plan

Understand that shapes in different categories can be classified into sub categories by examining their shared attributes

teaches Common Core State Standards CCSS.Math.Content.3.G.A.1 http://corestandards.org/Math/Content/3/G/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
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

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Big Ideas: We can classify two-dimensional shapes by their properties or attributes. Shapes with the same attributes can be grouped to make a subgroup. This lesson builds on expanding students' ability to reason with shapes and their attributes. This task requires students to sort quadrilaterals into subcategories based on shared attributes and common properties. The lesson also includes examples of quadrilaterals that do not belong to any of these subcategories. This builds towards students’ future work with classifying complex figures. Vocabulary: polygon, quadrilateral, subcategory/subgroup, rectangle, rhombus, square, trapezoid, right angle, congruent Special Materials: Pattern blocks (optional) Graph paper or square dot paper (optional) Printout of geometric figures in lesson (optional) A rectangular strip of paper to be used as a benchmark to compare sides and angles