We've launched a new feature to a portion of our users that will be available to everyone in the near future. You can now see Common Core State Standards on math content pages, and teachers with classes will see them on the new Content tab. Hovering over a standard will show its description. This will make it easier than ever to align Khan Academy content with lesson plans and curriculum documents, and to explore related content.
CCSS will be available on math videos, articles, and exercises.
Logged-in teachers will see CCSS on their class Content tab.