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A community library of technology tools, lessons, activities, and support materials for teaching and learning mathematics.

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Enroll in one of our Math Forum Online Courses:
  PoW Membership: Resources & Strategies for Effective Implementation
  Differentiating Math Instruction: Using Rich Tasks, Whole Group Discussion, and Small Group Work to Reach All Learners
  Developing Powerful Problem Solvers

Powerful Problem Solving
Do you have a copy of Powerful Problem Solving by Max Ray-Riek? Check out our Book Companion Site and classroom videos!

Activities with Rigor and Coherence - ARCs
ARCs integrate a wide array of NCTM resources to optimize opportunities for learning, including Illuminations and Student Explorations in Mathematics. ARCs also include community features that offer opportunities for social interaction. Engage in online discussions with other math educators, post a comment, and give feedback with ratings and reviews. Check them out here on the NCTM website.

What's Hot?

[July 28] Triangle Congruence ARC at NCTM: Suzanne explains, "One of the new ARCs (Activities with Rigor and Coherence) that NCTM offers under the Classroom Resources tab on their site, refers teachers to the Congruence Theorems tool."

[July 25] Math Centers: Ann5664 asks, "What would be a great way to formally assess students if this interactive were to be used as part of a math center?"

[June 30] Number Shapes: Maurici announces, "Lately I've been seeing Andrew Fenner sending messages across the Internet."

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Tool: Bobbie Bear
by NCTM Illuminations


Tracey, Gene, and Richard.


Tool: Fraction Mash
by New York Hall of Science