Jensen, Paz Alegria Lacsamana. <br/><br/>
Calculations made easy :  addition & multiplication subtraction & division / 
Paz Alegria Lacsamana Jensen. 
 - ix, 158 p. ;  22 cm. 
<br/><br/> Includes bibliographical references. 
<br/><br/><label>ISBN: </label>978-971-27-2648-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching.