Mathematics: A Practical Odyssey
Key differences between 8th and 7th editions
 Period between current and previous publications: 4 years (2015 vs 2011).
 Johnson and Mowry's Mathematics book was first published in 1994.
 The new Eighth Edition consists of 13 chapters as well as the previous one and contains the same number of pages.
 New section "1.6 Deductive Proof of Validity" covers formal proofs of validity, rules of replacement.
 In Chapter 3 the section on probabilities in genetics covers hemophilia, an inherited blood clotting disorder.
 Chapter 5 takes up topics of interest for all college students, such as loans and maxedout credit cards.
 Chapter 7 has interesting material on why sexagesimal (base 60) system is used to measure angles and time.
 Chapter 11 on Markov Chains has been retitled and reorganized, and includes two new sections "11.1 Markov Chains and Tree Diagrams" and "11.2 Markov Chains and Matrices".
8th Edition of
Mathematics: A Practical Odyssey
eBook (digital format), 1024 pages
eBook ISBN: 9781305464858
Published by: Cengage Learning, January 01, 2015
Book Store  Price 
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 $37.79 
Hardcover, 1024 pages
ISBN10: 130510417X
ISBN13: 9781305104174
Published by: Cengage Learning, January 01, 2015
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7th Edition of
Mathematics: A Practical Odyssey
eBook, 1024 pages
eBook ISBN: 9781133170495
Published by: Wadsworth Publishing, February 01, 2013
Book Store  Price 
 Available

 $43.99 
Hardcover, 1024 pages
ISBN10: 0538495057
ISBN13: 9780538495059
Published by: Cengage Learning, January 01, 2011
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 $199.95

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6th Edition of
Mathematics: A Practical Odyssey
Hardcover, 1008 pages
ISBN10: 0495110744
ISBN13: 9780495110743
Published by: Brooks Cole, September 22, 2006
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 $70.34

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with CengageNOW, Personal Tutor, and Printed Access Card
Hardcover, 912 pages
ISBN10: 0495012734
ISBN13: 9780495012733
Published by: Cengage Learning, September 22, 2006
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Hardcover
 Used 8th edition can save you $78.46 over the new one.

Used previous 7th edition costs $81.61 less than the used 8th.