Speed mathematics: : secrets of lightening mental calculation 
Handley, Bill. 
 - Third Edition. 
 -  Wrightbook,  2008 
 - xi, 307 pages 
<br/><br/>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental arithmetic-study and teaching.
<br/><br/><label>Dewey Class. No.: </label>513.9 H19s 2008