Swain Robert L <br/><br/>
Understanding arithmetic 

 -  1963 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>61845 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Arithmetic<br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B1, K3