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Lesson Plan

10. Classify shapes into categories (A)

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.MP7 http://corestandards.org/Math/Practice/MP7
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Lesson objective: Understand that shapes may share some attributes with other shapes in different categories.

This lesson provides an opportunity for students to apply their knowledge and understanding of common attributes to a mathematical situation. Students are asked to assess whether a shape fits into a category based on the attributes of the shape.

Key Concept students will use: 

  • all rhombuses, rectangles and squares are examples of quadrilaterals, but not all quadrilaterals fit in those subcategories

Skills students will use:

  • reasoning with shapes and their attributes; (Grade 2, Unit 10)
  • recognizing and drawing shapes with specified attributes, such as a given number of angles or a given number of equal faces; (Grade 2, Unit 10)
  • identifying triangles, quadrilaterals, pentagons, hexagons, and cubes; (Grade 2, unit 10)

Students engage in Mathematical Practice 7 (look for and make use of structure)  as they determine categories and subcategories of shapes by identifying and reasoning about their attributes. 

Key vocabulary: 

  • attribute
  • quadrilateral
  • pentagon
  • triangle
  • parallel

Special materials needed:

  • index card or other tool for measuring right angles
Related content

Appears in

Solving problems involving shapes

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