Whether you're experiencing new challenges or celebrating new breakthroughs, your firsthand perspective is invaluable. Legislators want to understand the impact of these decisions through your eyes.

A tessellation is a repeating pattern of polygons that covers a plane with no gaps or overlaps. What kind of tessellations can you make out of regular polygons? What shapes tessellate? If shapes can ...

A comprehensive and coherent set of mathematics standards for each and every student from prekindergarten through grade 12, Principles and Standards is the first set of rigorous, college and career ...

The NCTM representatives outlined four critical priorities during their congressional meetings: Strengthening the Foundation ...

Data-driven decision making has been a hot topic for the past ten years. Schools and teachers use data in many ways. Schools use data to evaluate existing programs and make decisions, such as where to ...

Start this lesson by reading a counting book of your choice. (Ten Black Dots by Donald Crews is especially appropriate, but any book which uses a "count on by 1" strategy will work.) Then ask students ...

There are many fun and innovative ways to celebrate Pi Day in your classroom and beyond—you probably already use it as a jumping-off point for key mathematical lessons. If you're in need of something ...

Bobbie Bear is planning a vacation and wants to know how many outfits can be made using different colored shirts and pants. Click on a shirt or a pair of pants and drag it over Bobbie Bear. Release ...

NCTM is committed to offering standards-based resources that improve the teaching and learning of mathematics for each and every student. Explore these resources and ...

Use this tool to strengthen understanding and computation of numerical expressions and equality. In understanding equality, one of the first things students must realize is that equality is a ...

This tool allows you to learn about various geometric solids and their properties. You can manipulate and color each shape to explore the number of faces, edges, and vertices, and you can also use ...

When students become active doers of mathematics, the greatest gains of their mathematical thinking can be realized. The process of sense making begins when we create classrooms full of curious ...