"Principles and Standards extends the vision of NCTM's previous three Standards documents and represents a continuing effort to support mathematics teachers and ensure that every student receives a high-quality mathematics education. The document delineates six Principles that set forth important characteristics of Mathematics programs and ten Standards that discuss the mathematics students need to be able to know and do across the grades."

A site that shows a wide variety of standards including mathematics. This link will bring you to the math section.