Adding it up : helping children learn mathematics 

 - Washington, DC:  National Academies Press,  2001 
 - xvii, 454 p. : ill. ; 27 cm 
<br/><br/><label>ISBN: </label>9780309069953 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)
<br/><br/><label>Dewey Class. No.: </label>372.7 KIL