Erminda E. De Leon <br/><br/>
Math in a challenging world/ 
Erminda E. De Leon. 
 - Marikina city:  Instructional Coverage System Publishing, Inc.,  2017. 
 - 552 pages:  Tables, illustrations ;  28 cm. 
<br/><br/><br/>English 
<br/><br/><label>ISBN: </label>9717194912 
<br/><br/><label>Subjects--Topical Terms: </label>
<br/><br/><label>Dewey Class. No.: </label>510  / D346m