00573nam a22001577a 4500008004100000020001800041050002200059100002200081245009500103250001200198260003100210300002600241500004400267650005000311650005400361161103b        xxu||||| |||| 00| 0 eng d  a9780205483921  aQA 135.6 V36 2007  aVan de Wall, John  aElementary and middle school mathematics :bteaching developmentally/cJohn A. Van de Wall  a6th ed.  aBoston :bPearson ,cc2007  axxvi, 570p. :bill. ;  aIncludes appendix ,reference and index.  aMathematicsxstudy and teaching (Elementary )  aMathematics xstudy and teaching (middle school )