Making sure of arithmetic / 
Robert Lee Morton ...[et al.]. 
 - New York :  Silver Burdett,  c 1955. 
 - 412 p. :  ill. ;  21 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/>346   346 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic.
<br/><br/><label>Dewey Class. No.: </label>511 / M846m