Explore Books on
mathematics--study and teaching (middle school)
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View Teaching mathematics meaningfully By Allsopp, David Ph. D. 
Teaching mathematics meaningfully
By Allsopp, David Ph. D.
View Elementary and Middle School Mathematics: Teaching Developmentally, Loose-Leaf Version (9th Edition) By John A. Van de Walle,Karen S. Karp,Jennifer M. Bay-Williams 
Elementary and Middle School Mathematics: Teaching Developmentally, Loose-Leaf Version (9th Edition)
By John A. Van de Walle,Karen S. Karp,Jennifer M. Bay-Williams