This site has crosswalks and unpacked standards for all grade levels. They've done a great job of interpreting what mastery of each standard will entail.
This is going to be a phenomenal site for resources relating to implementation of the CCSS. It's chaired by Dr. Bill McCullum, who also chaired the CCSS committee. Check back for updates as resources become available.
This is an AWESOME document for helping K-2 teachers understand the meanings of the first domain of the CCSS in math.
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