Number properties : GRE strategy guide. 

 - 4th ed 
 - New York  Manhattan Prep  2014 
 - 207 
<br/><br/><label>ISBN: </label>9781937707866 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education
<br/><br/><label>Dewey Class. No.: </label>378.1662 MAN