Ashlock, Robert B., <br/><br/>
Error patterns in computation :  using error patterns to improve instruction / 
Robert B. Ashlock. 
 - 9th ed. 
 - Upper Saddle River, N.J. :  Merrill Prentice Hall,  c2006. 
 - x, 274 p. :  ill. ; 
<br/><br/><label>ISBN: </label>0131198866 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic--Study and teaching (Elementary)
<br/><br/><label>LC Class. No.: </label>QA135.5  / .A782 2006 
<br/><br/><label>Dewey Class. No.: </label>372.7/2044