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Lesson Plan

10. Classify shapes into categories (A)

teaches Common Core State Standards 111.5.6.B
teaches Common Core State Standards 3.G.2
teaches Common Core State Standards CCSS.Math.Content.3.G.A.1
teaches Common Core State Standards CCSS.Math.Practice.MP7
teaches Common Core State Standards MAFS.3.G.1.1
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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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