Book contents
- Frontmatter
- Contents
- List of illustrations
- Preface to the fourth edition
- Preface to the third edition
- Preface to the second edition
- Preface to the first edition
- Acknowledgements
- 1 Introduction
- 2 Preliminary copy-editing, design and specimen pages
- 3 Preparing the text for the typesetter
- 4 Illustrations
- 5 Proofs
- 6 House style
- 7 Preliminary pages
- 8 Indexes
- 9 Other parts of a book
- 10 Bibliographical references
- 11 Literary material
- 12 Multi-author and multi-volume works
- 13 Science and mathematics books
- 14 Other special subjects
- 15 Reprints and new editions
- 16 On-screen editing
- Appendixes
- 1 Checklist of copy-editing
- 2 Book sizes
- 3 Abbreviations for states in the USA
- 4 Phonetic symbols
- 5 The Russian alphabet
- 6 Old English and Middle English letters
- 7 French and German bibliographical terms and abbreviations
- 8 Mathematical symbols
- 9 Hebrew
- 10 Arabic
- 11 Islamic, Chinese, Japanese and French Revolutionary calendars
- 12 Countries of the former USSR, Baltic states and former Yugoslavia
- 13 Proof correction symbols
- 14 How to check that an ISBN is correct
- Glossary
- Select bibliography and other resources
- Index
14 - How to check that an ISBN is correct
from Appendixes
Published online by Cambridge University Press: 05 August 2012
- Frontmatter
- Contents
- List of illustrations
- Preface to the fourth edition
- Preface to the third edition
- Preface to the second edition
- Preface to the first edition
- Acknowledgements
- 1 Introduction
- 2 Preliminary copy-editing, design and specimen pages
- 3 Preparing the text for the typesetter
- 4 Illustrations
- 5 Proofs
- 6 House style
- 7 Preliminary pages
- 8 Indexes
- 9 Other parts of a book
- 10 Bibliographical references
- 11 Literary material
- 12 Multi-author and multi-volume works
- 13 Science and mathematics books
- 14 Other special subjects
- 15 Reprints and new editions
- 16 On-screen editing
- Appendixes
- 1 Checklist of copy-editing
- 2 Book sizes
- 3 Abbreviations for states in the USA
- 4 Phonetic symbols
- 5 The Russian alphabet
- 6 Old English and Middle English letters
- 7 French and German bibliographical terms and abbreviations
- 8 Mathematical symbols
- 9 Hebrew
- 10 Arabic
- 11 Islamic, Chinese, Japanese and French Revolutionary calendars
- 12 Countries of the former USSR, Baltic states and former Yugoslavia
- 13 Proof correction symbols
- 14 How to check that an ISBN is correct
- Glossary
- Select bibliography and other resources
- Index
Summary
The last digit of an ISBN (see pp. 176–7) is known as the check digit and is used to pick up errors in transcribing the previous twelve digits (or the previous nine under the old 10-digit system). The check digit of an old 10- digit ISBN was always one digit (1–9 or x, meaning 10). In a 13-digit ISBN the check digit is always one digit between 0 and 9; there is no x (10) in the new system.
The check digit of a 13-digit ISBN can be calculated using a modulus 10 algorithm, as follows:
The first twelve digits are multiplied alternately by 1 and 3, and then added together.
The resulting total is divided by 10, to determine the remainder.
The remainder is subtracted from 10, and the result is the check digit. If the remainder is 0, no subtraction is required; the check digit will be 0.
For an ISBN to be valid, the sum of the first twelve digits multiplied alternately by 1 and 3 plus the check digit must be divisible by 10 without a remainder.
- Type
- Chapter
- Information
- Butcher's Copy-editingThe Cambridge Handbook for Editors, Copy-editors and Proofreaders, pp. 484Publisher: Cambridge University PressPrint publication year: 2006