Thank you for your interest in NCTM’s Illuminations. Beginning in mid-April, all Illuminations content will be moving to Interactives will remain openly available and NCTM members will have access to all Illuminations lessons with new filtering and search options. We hope you will continue to utilize and enjoy these resources on

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About Illuminations

Illuminations Navigation Guide 

Find the most relevant Illuminations resources quickly and easily by referencing this guide for navigating the website.

Who We Are

Illuminations is a project designed by the National Council of Teachers of Mathematics (NCTM).

What We Do

Illuminations works to serve you by increasing access to quality standards-based resources for teaching and learning mathematics, including interactive tools for students and instructional support for teachers.

Our Resources

Download a flyer here.


How to Help Build Quality Resources

Let's work together to build a connected mathematics education community! Contact us and provide us with . . .

  • Success Stories 

    • Have you used an Illuminations resource successfully in your classroom? Let us know, and you might be featured on our website and in our e-newsletter!

  • BrainTeasers 

    • Do you have an original puzzle that your students loved? Other students would love it too! Let us add it to our collection so other teachers can find it. They'll appreciate you, and you will receive credit too.

  • Lesson Plan Input

    • See a typo? Have a suggestion for an extension? Do you know what has enhanced a particular lesson? Share it with us, and it could be used to update a lesson.

Download a flyer here.