Handley, Bill,  1943-, <br/><br/>
Speed mathematics :  secret skills for quick calculation / 
Bill Handley. 
 - xiii, 256 pages.;  23 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0471467316  Hadiah 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental arithmetic.