In 2009–2010, state organizations led an effort to write common standards in mathematics and English language arts; the resulting Common Core State Standards in Mathematics have been adopted by 44 states. Mathematicians and mathematics educators were significantly involved in the writing process. If well implemented, these standards hold the promise of improving the preparation of students for college and career. I will give a brief overview of the standards writing process, the structure of the standards, and the current state of implementation.