Mathematical challenges for the middle grades. 

 - Reston, VA :    National Council of Teachers of Mathematics,    1964 . 
 - vii, 46 p. :    ill. ;    23 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Mathematics -- Problems, exercises, etc.
<br/><br/><label>Dewey Class. No.: </label>510.8