Build student understanding of the defining attributes of triangles with this sorting activity. Students will cut out different shape cards and sort them into examples and non-examples of triangles.

How many sides does a triangle have? Three! Sort shapes that have three sides and shapes that don't have three sides with this wacky worksheet.

Give your students a chance to sort polygons into categories that make sense to them.

Teach your students to sort triangles as acute, right, or obtuse based on their internal angle type.

The animals are all mixed up--can your kindergartener sort them out and count them up according to kind?

Is it a square? Is it a triangle? This cut and paste worksheet will help your child categorize quadrilaterals, which are four-sided shapes.

Are your students still tripped up by those tricky trapezoids? This geometry worksheet can help! Give your second graders a chance to have fun while they practice trapezoid identification with this cut-and-paste activity.

Can your first graders tell the difference between a square and a cube? How about a triangle and a cone? Use this geometry assessment to gauge your students’ abilities to use attributes to sort 2-D and 3-D shapes.

Can your kid tell the difference between 2-dimensional and 3-dimensional shapes? Kindergarten is a good time to start!

Bust out those crayons, it's time to test your knowledge of basic shapes! Have your first grader sort out these shapes by color.

Stellar students, get ready for a math mission from outer space! Your child will get to help this alien sort and color the different shapes in this worksheet.

Pentagons make for perfect houses! Help students to identify and develop an understanding of this 2-D shape with this fun activity. Students will sort out the pentagons from other shapes and then turn them into houses.

Assess your students’ understanding of the differences between 2-D and 3-D shapes using this shape assessment.

Trace, then color, then write, all while getting familiarized with basic shapes: circles, squares, triangles and rectangles.

Help your students determine if a shape is regular or irregular!

What's the connection? Make lines between the dots to create triangles with this dotty worksheet.