Modern arithmetic through discovery / 
Robert Lee Morton ... [et al.]. 
 - Morristown, N.J.:   Silver Burdett,   c1962-.  
 - vii, 362 p. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)<br/>Arithmetic--Study and teaching (Elementary)
<br/><br/><label>Dewey Class. No.: </label>372.7