"Progressions Documents", the documents which outline specific mathematical learning progressions upon which the Common Core State Standards were based. If you're in a state that teaches these you should definitely find some time to read through them. If you are a teacher elsewhere, it can't hurt to understand these progressions.
2013 Pi Day is coming up 3/14. Here are some sites with fun and relevant class activities from our recently started blog supporting Common Core and Ed Tech.
Please take a look at the site and provide any feedback! Thanks,