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Foundational and pre-algebra topics for grades 6, 7 and 8
This resource was reviewed using the Curriki Review rubric and received an overall Curriki Review System rating of 3, as of 2011-05-27.
Not sure why CK-12 or Curriki is not listing the solidly developed elementary school OER mathematics textbook seventh grade textbook: http://www.ck12.org/flexbook/flexbook/3013 . It deserves to be listed. Great textbook!