Trewartha Grace. <br/><br/>
Manhattan Prep GMAT :  Number properties. 

 - 6th ed. 
 - US :  MG Prep Inc,  2014. 
 - 135 p. :  28 cm. 
<br/><br/><label>ISBN: </label>9781941234051 
<br/><br/><label>Subjects--Topical Terms: </label><br/>number.
<br/><br/><label>Dewey Class. No.: </label>510 TRE