2025 Year Game Rules of the Game: Use only the digits 2, 0, 2, and 5, in any order, with the operations +, −, , , (raised to a power), √⬚ (square root), ! (factorial), and !! (double factorial) to write expressions for the counting numbers 1 through 100. Grouping symbols may also be used. Multi-digit numbers such as 20, 220, or 0.22 will be accepted this …

A comprehensive and coherent set of mathematics standards for each and every student from prekindergarten through grade 12, Principles and Standards is the first set of rigorous, college and career readiness standards for the 21st century. Principles and Standards for School Mathematics outlines the essential components of a high-quality school mathematics program. It …

Educational decisions made by teachers, school administrators, and other professionals have important consequences for students and for society. The Principles for school mathematics provide guidance in making these decisions. The Standards for …

Find essential tools and resources for mathematics teachers, including lesson plans, activities, and professional development materials from the National Council of Teachers of Mathematics.

Adjustable Spinner Grade: PreK to 2nd, 3rd to 5th, 6th to 8th, High School Change the number of sectors and increase or decrease their size to create any type of spinner. Then, conduct a probability experiment by spinning the spinner many times. How does the experimental probability compare with the theoretical probability? This interactive is optimized for your desktop and tablet.

Cube Nets Grade: 3rd to 5th, 6th to 8th A net is a two-dimensional figure that can be folded into a three-dimensional object. Which of the nets below will form a cube? This interactive is optimized for your desktop and tablet.

The National Council of Teachers of Mathematics provides resources and support for mathematics educators.

Geometric Solids Grade: PreK to 2nd, 3rd to 5th, 6th to 8th, High School This tool allows you to learn about various geometric solids and their properties. You can manipulate and color each shape to explore the number of faces, edges, and vertices, and you can also use this tool to investigate the following question: For any polyhedron, what is the relationship between the number of faces ...

NCTM is committed to bringing the math community together for engaging content that will help transform the learning and teaching of mathematics. Join your colleagues for the NCTM 2025 Virtual Meeting, April 2-5, and share in the excitement and love of math!

My Championship Playbook January 2025 In anticipation of the upcoming Spring Conference in Kansas City, NCTM members have been sharing pages from their championship playbooks. In this month’s message, as I reflect on a pivotal period in my teaching career, I would like to share a page from my championship playbook. Years ago, when my state adopted college and career readiness standards, our ...