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    The Trachtenberg Speed System of Basic Mathematics by Jakow Trachtenberg (Englis

    • Item No : 156711833921
    • Condition : Brand New
    • Brand : No brand Info
    • Seller : the_nile
    • Current Bid : US $14.46

    • * Item Description

    • By Jakow Trachtenberg, Ann Cutler, Rudolph McShane. He devised a set of rules that allows every child to make multiplication, division, addition, subtraction and square-root calculations with unerring accuracy and at remarkable speed.
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