Grade 3 · Geometry

CCSS.MATH.CONTENT.3.G.A.1

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.

Read this standard on the official Common Core site

Lessons that teach this standard

• Sorting Shapes into Categories

  Why shapes belong to more than one group at once, what makes a square also a rectangle, and how splitting a shape into equal parts gives each part a fraction name.