Developing computational skills / 
by Marilyn N. Suydam and Robert E. Reys. 
 - Reston, :  Virginia ,  1978 
 - viii, 245p. :  ill. ;  24cm 
 - It's year-book .
<br/><br/>Includes bibliographies. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithematic--Study and teaching<br/>Numerical calculations
<br/><br/><label>Dewey Class. No.: </label>510.7 NAT