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I thought to search the Math Forum's site for "trachtenberg" using this page: http://mathforum.org/grepform.html and these are the pages that I found with information that might be helpful: Ask Dr. Math FAQ on Trachtenberg Speed System http://mathforum.org/dr.math/faq/faq.trachten.html Finger Multiplication http://mathforum.org/dr.math/problems/clarm4.18.97.html I hope this helps. -Suzanne A., for the Teacher2Teacher service
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