Key Instructional Shifts of the Common Core State Standards for Mathematics

Sometimes looking at implementing the Common Core standards appears as a daunting task!  "There's so much for students to learn!"  "How can I possibly do this?"  "How can I prioritize these things?" 
Achievethecore has put together a great tool that identifies the shifts in Common Core mathematics standards and the Major Clusters, Additional Clusters and Supporting Clusters for grades K-8.  Check out this great resource on achievethecore.org  @ http://achievethecore.org/content/upload/Focus%20in%20Math_091013_FINAL.pdf