Handley, Bill
Speed mathematics : secrets of lighting mental calculation / Bill Handley - 3rd. ed. - Australia : Wrightbooks, 2008 - xi;307p. : ill.; 23cm.
0731407814
Mental arithmetic--Study and teaching
Speed mathematics : secrets of lighting mental calculation / Bill Handley - 3rd. ed. - Australia : Wrightbooks, 2008 - xi;307p. : ill.; 23cm.
0731407814
Mental arithmetic--Study and teaching
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