This is an AWESOME document for helping K-2 teachers understand the meanings of the first domain of the CCSS in math.
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.
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