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Grade 3

CCSS Math Standard: 3.G.1

Reason with shapes and their attributes. Understand that shapes in different categories (e.g., rhombuses, rectangles, and others) may share attributes (e.g., having four sides), and that the shared attributes can define a larger category (e.g., quadrilaterals). Recognize rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories.

Trapezoids or Not? – Concept Attainment

In this concept attainment lesson, students try to determine if shapes are trapezoids or not.

Grouping Quadrilaterals In A Hierarchy

Can we classify quadrilaterals like we classify living things?