Speed mathematics : secret skills for quick calculation /
Handley, Bill. ,
Speed mathematics : secret skills for quick calculation / Bill Handley. - xiii, 256 pages : illustrations ; 23 cm.
0471467316
Mental arithmetic.
QA111 / .H36 2003
Speed mathematics : secret skills for quick calculation / Bill Handley. - xiii, 256 pages : illustrations ; 23 cm.
0471467316
Mental arithmetic.
QA111 / .H36 2003