Featured Brain Teaser. Ask a friend to pick a number from 1 through 1,000. After asking him ten questions that can be answered yes or no, you tell him the number.

In this unit, students use plastic as a context to explore mathematical and environmental concepts. The unit starts with an investigation of the surface area of a right cylinder, using a …

Data Analysis & Probability-Kindergarten. Practice; Counting & Cardinality; Algebraic Thinking; Number & Operations

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 …

Investigating Functions with a Ferris Wheel: Distance vs. Width A Web Sketchpad activity helps students make sense of relationships between quantities, in this case the way that the …

Illuminations: Resources for Teaching Math. Contact Us; Join NCTM; Troubleshooting; About Illuminations; Lessons. All Lessons; Pre-K-2; 3-5; 6-8; 9-12; Brain Teasers

Students discover the relationships between area and perimeter as they prep for playing Square Off, a wonderful Calculation Nation ® game. This lesson helps students understand the math …

This lesson plan presents a classic game-show scenario. A student picks one of three doors in the hopes of winning the prize. The host, who knows the door behind which the prize is hidden, …

The Gateway to Standards-Based Mathematics Education. This site is designed to illuminate the new NCTM Priniples and Standards for School Mathematics. Here are internet resources to …

Data Analysis & Probability-Kindergarten. Practice; Counting & Cardinality; Algebraic Thinking; Number & Operations