Handley, Bill. <br/><br/>
Speed mathematics: :  secrets of lightening mental calculation / 
Bill Handley . 
 - Third Edition. 
 - xi, 307 pages ;  23 cm. 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental arithmetic-study and teaching.