The Common Core State Standards for Mathematics (CCSSM) were "designed to be robust and relevant to the real world, reflecting the knowledge and skills that young people need for success in college and careers" (CCSSI 2010). For the first time in U.S. history, a set of standards is established that will be taught in nearly every state. Forty-four states have already adopted CCSSM. In this article, the authors provide a broad overview of the CCSSM by addressing four major parts of the document. First, they describe the Standards for Mathematical Practice, which apply to all students from kindergarten through grade 12. They then describe the parts of the grade-level Standards. Third, they explain how the Standards develop across grade levels. Finally, they discuss the intersection of the domains of the CCSSM. (Contains 1 figure and 3 tables.)