Illuminations: Welcome to Illuminations
Explore our library of 100 online activities that help to make math come alive in the classroom or at home
View our collection of 515 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
Highlighted Activty
Circle Tool
Compare Radius, Diameter, Circumference, and Area 		3-8

Circle ToolEnhance your understanding of the measures of a circle using the Circle Tool. Use interactive circles, tables, graphs, and word problems to explore the relationships between radius, diameter, circumference, and area.

Highlighted Unit
Movement with Functions
Bring Movement to the Exploration of Equations 		6-12
Movement with FunctionsInvestigate linear equations, rate of change, and systems of equations in a series of explorations using movement. Students are challenged to explain the math behind activities involving motion detectors, running on a football field, and racing remote-controlled cars.

Professional Development

Feed the Pig


Family GuideFeed the Pig for Tweens, a project of AICPA and the Ad Council in cooperation with NCTM, helps children in grades 4‑6 learn sound saving and spending habits while building important math skills.

Online Professional Development


NCTM E-Workshops offer quality professional development in the comfort of your own home or school.

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  • Mathematics Teacher
  • Math Teaching in the Middle School
  • Teaching Children Mathematics
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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.