Tyagi, S. K. <br/><br/>
Teaching of arithmetic  / 
Tyagi, S. K. 
 - New Delhi:  Commonwealth,  2008. 
 - 294p.; 21cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>817169828x 
<br/><br/><label>Dewey Class. No.: </label>372.72044 TYA