Adding it up : helping children learn mathematics [E-Book] / Mathematics Learning Study Committee, Center for Education, Division of Behaviorial and Social Sciences and Education, National Research Council ; Jeremy Kilpatrick, Jane Swafford, and Bradford Findell, editors.
Kilpatrick, Jeremy.
Swafford, Jane. / Findell, Bradford.
Washington, DC : National Academy Press, c2001
xvii, 454 pages : illustrations
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