Illuminations: Welcome to Illuminations
Explore our library of 103 online activities that help to make math come alive in the classroom or at home
View our collection of 506 lessons for preK-12 math educators
Learn about NCTM’s Principles and Standards for School Mathematics
Check out hundreds of exemplary online resources, as identified by an editorial panel
How Can We Improve?
Got ideas for Illuminations?
Give us you input with this brief survey 		 

Site ImprovementPlease help us improve your Illuminations experience by completing this brief survey. It'll take you only 2‑3 minutes, and your responses are anonymous. Thank you in advance!

Highlighted Lesson
Island Inequality Mat
Students use images to explore the concepts of greater than, less than, and equal to.
Using various instructional materials such as modelling clay, buttons, beans, and cotton balls, students create amounts to compare using the open-mouthed fish.

Professional Development

Book for Parents


Family GuideIlluminations is pleased to offer A Family's Guide: Fostering Your Child's Success in School Mathematics as a free, fully downloadable PDF document.

Got an Idea Worth Sharing?


Submit an article for one of NCTM's award-winning journals:

  • Mathematics Teacher
  • Math Teaching in the Middle School
  • Teaching Children Mathematics
National Council of Teachers of Mathematics MarcoPolo Verizon Foundation
More and Better Mathematics for All Students
© 2000 National Council of Teachers of Mathematics
Use of this Web site constitutes acceptance of the Terms of Use

The National Council of Teachers of Mathematics is a public voice of mathematics education, providing vision, leadership, and professional development to support teachers in ensuring mathematics learning of the highest quality for all students. The views expressed or implied, unless otherwise noted, should not be interpreted as official positions of the Council.