In this 3.G.1 Third Grade Common Core lesson students understandthat shapes in categories share attributes and shared attributes define a larger category.

Using L.K.6 Kindergarten Common Core Lesson, students use words and phrases acquired through conversations, reading and being read to, and responding to texts.

This 1.G.1 First Grade Common Core Lesson teaches us that shapes can be put into many different categories.

In this 4.G.1 Fourth Grade Common Core Lesson, students identify points, lines, line segments, rays, angles, perpendicular and parallel lines.

In this 5.G.3 Fifth Grade Common Core Lesson, students understand that attributes belonging to a category of two-dimensional figures also belong to all subcategories of that category.

Using this K.MD.1 Kindergarten Common Core Lesson, students sort objects into short and tall categories to learn about measurement.

Using this K.MD.3 Kindergarten Common Core Lesson, students sort objects into categories in order to find similarities between objects.

Using this K.G.4 Kindergarten Common Core Lesson, students analyze and compare two- and three-dimensional shapes by sorting them into similar groups.