00575nam a22001577a 4500008004100000020001500041050002200056100003100078245009400109250001200203260002900215300006800244440004600312650003500358700002400393160706b        xxu||||| |||| 00| 0 eng d  a0205483925  aQA 135.6.V36 2007  aVan de Walle,John A.d2007  bTeaching developmentally/cJohn A.Van de WalleaElementary and middle school mathematics:  a6th ed.  aBoston;bPearson,c2007.  axxvi,509(28) p.bIncludes bibliographical references and index.  aElementary and middle school mathematics:  aMathematics-Study and teaching  aJohn A.Van de Walle