David G. Wells Books

Can You Solve These?

By David Wells, David G. Wells

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The Penguin Dictionary of Curious And Interesting Numbers

By David G. Wells

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Curious And Interesting Puzzles, The Penguin Book Of

By David Wells, David G. Wells, D. G. Wells, Wells, David

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''"Of immense interest to those who enjoy recreational maths and puzzles . . . even the most hardened puzzler will find something new." — Mathematical GazettePuzzles are as old as history itself, f...

You Are a Mathematician

By David G. Wells

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The Penguin Book of Curious And Interesting Mathematics

By David G. Wells

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The Penguin Book Of Curious And Interesting Numbers: Revised Edition

By David Wells, David G. Wells, D. G. Wells

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Why was the number of Hardy's taxi significant? Why does Graham's number need its own notation? How many grains of sand would fill the universe? What is the connection between the Golden Ratio and...

You Are a Mathematician

By David G. Wells

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Recreations in logic

By David G. Wells

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Hidden Connections, Double Meanings: A Mathematical Exploration

By David Wells, David G. Wells

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Mathematics Through Problem solving Problem Solving for National Curriculum Mathematics

By David G. Wells

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.