Mathematical Reasoning for Elementary Teachers
Key differences between 7th and 6th editions
 Period between current and previous publications: 3 years (2014 vs 2011).
 Mathematical Reasoning for Elementary School Teachers book was first published in 1994.
 New the 8 Standards for Mathematical Practice from the Common Core State Standards for Mathematics.
 Entirely updated Into the Classroom features.
 Chapter 3 "Numeration and Computation" has been reorganized.
 Chapter 4 includes new discussion Illustrating Factors and Divisibility with a Manipulative
 Chapter 14 "Probability" has been completely rewritten to provide a comprehensive introduction to elementary probability for future K8 teachers.
7th Edition of
Mathematical Reasoning for Elementary Teachers
eBook, 864 pages
eBook ISBN: 9780321901002
Published by: Pearson, January 09, 2014
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 $50.39 
Hardcover, 864 pages
ISBN10: 0321900995
ISBN13: 9780321900999
Published by: Pearson, January 19, 2014
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 $182.17

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6th Edition of
Mathematical Reasoning for Elementary School Teachers
Hardcover, 944 pages
ISBN10: 0321693124
ISBN13: 9780321693129
Published by: Pearson, January 13, 2011
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with MyMathLab/MyStatLab and Activities
Hardcover, 852 pages
ISBN10: 0321786483
ISBN13: 9780321786487
Published by: Pearson, June 25, 2011
Book Store  New  Used  Rent 
 $153.67

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plus MyMathLab with Pearson eText  Access Card Package
Hardcover, 944 pages
ISBN10: 0321759923
ISBN13: 9780321759924
Published by: Pearson, April 30, 2011
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 $700.00

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5th Edition of
Mathematical Reasoning for Elementary Teachers
Hardcover, 1120 pages
ISBN10: 0321460847
ISBN13: 9780321460844
Published by: Pearson, January 07, 2008
Book Store  New  Used  Rent 
 $19.95

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Hardcover
 Used 7th edition can save you $123.86 over the new one.

Used previous 6th edition costs $54.83 less than the used 7th.