October 2025 - We're launching a short, quarterly Advocacy Newsletter to keep you informed about how NCTM is working to advance policies at the federal level that support mathematics teachers, ...

The Designing Innovative Lessons and Activities for Mathematics Teaching Grant is sponsored by the Mary P. Dolciani Halloran Foundation. This grant supports the research-and-writing of mathematics ...

Log in and then download this digital certificate of participation and self-document your participating hours. Your school or district determines the acceptance of ...

Thinking about numbers using frames of 10 can be a helpful way to learn basic number facts. The four games that can be played with this applet help to develop counting and addition skills. (This ...

Quilters and other designers sometimes start by producing square patches with a pattern on them. These square patches are then repeated and connected to produce a larger pattern. Create your own patch ...

A teacher shares strategies for helping students communicate their thinking about mathematics.

Founded in 1920, the National Council of Teachers of Mathematics (NCTM) is the world's largest mathematics education organization throughout the United States and Canada.

Choose a polygon, and reshape it by dragging the vertices to new locations. As the figure changes shape, the angle measures will automatically update. Animation: For triangles and quadrilaterals, you ...

Pi Fight is designed to help students become comfortable with using both radians and degrees. Choose between radians, degrees, or a combination of both to hit Okta, the octopus. Choose between radians ...

Exploring Math through Literature, Pre-K–8 is an online teacher resource filled with lessons and activities that teach mathematical concepts while engaging students in a broad assortment of children’s ...