Williams, G. Arnell,  1964- <br/><br/>
How math works :  a guide to grade school arithmetic for parents and teachers / 
G. Arnell Williams. 
 - Lanham, Md. :  Rowman & Littlefield,  c2013. 
 - 325 p. :  ill, maps. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9781442218741 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic--Study and teaching (Elementary)
<br/><br/><label>LC Class. No.: </label>QA135.6  / W544H