National Council of Teachers of Mathematics

http://www.nctm.org/

Founded in 1920, the National Council of Teachers of Mathematics (NCTM) is the world’s largest mathematics education organization, with 80,000 members and more than 230 Affiliates throughout the United States and Canada.

The National Council of Teachers of Mathematics is the public voice of mathematics education, supporting teachers to ensure equitable mathematics learning of the highest quality for all students through vision, leadership, professional development, and research.