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 ...

This two-part e-example encourages students to use visualization, spatial reasoning, and geometric modeling to build their own patterns or recreate one from given square arrays. This two-part ...

Investigate congruence by manipulating the parts (sides and angles) of a triangle. If you can create two different triangles with the same parts, then those parts do not prove congruence. Can you ...

Attending conferences and networking with fellow educators is one of my favorite things to do! Last month, I had lots of opportunities to network with attendees at the NCTM Spring Conference in ...

Founded in 1920, the National Council of Teachers of Mathematics (NCTM) is the world's largest organization dedicated to improving mathematics education.

Look for and express regularity in repeated reasoning. Look for and make use of structure. Attend to precision. Use appropriate tools strategically. Model with mathematics. Construct viable arguments ...

Advancing excellence, access, and equity in mathematics requires the intentional design of lessons, classrooms, and schools where every student experiences belonging, agency, and joy. Equity ...

The programs of the National Council of Teachers of Mathematics present a variety of viewpoints. The content and views expressed or implied in these presentations should not be interpreted as official ...

The purpose of this book study guide is to provide stakeholder groups with a tool to initiate needed critical conversations and actions in early childhood and elementary mathematics. Format: The book ...

Join NCTM as we celebrate our Centennial with 100 Days of Professional Learning - live, free webinars presented by selected speakers from the NCTM Centennial Annual Meeting program that was to be held ...

It is with sadness that we announce the passing of James T. Fey, who will be remembered for his leadership in the mathematics education community, nationally and internationally, championing ...