Rivera, Derdinand. <br/><br/>
Math challenges :  enhancement exercises for high school math / 
by Ferdinand Rivera. 
 - Makati City :  Basic Media Systems,  c1998. 
 - 4 v. : ill. 
 - Math challenges ; v.4 .
<br/><br/> Contents. -- v.1. Freshman. -- v.2. Sophomore. - v.3. Junior. -- v.4. Senior. 
<br/><br/><label>ISBN: </label>9716590695 9716590709 9716590717 9716590725 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical recreations.