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

In this 5.G.4 Fifth Grade Common Core Lesson, students classify two-dimensional figures in a hierarchy based on properties.

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

In this 2.G.1 Second Grade Common Core Lesson, students will recognize and draw shapes having specific attributes such as given number of angles or sides.

In this 4.G.2 Fourth Grade Common Core Lesson, students classify shapes based on presence or absence of specific lines and angles.

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.

This 1.G.2 First Grade Common Core Lesson teaches that two shapes can be put together to make a new shape.

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