Hans Georg Weigand Books

This open access book provides an overview of Felix Klein’s ideas, highlighting developments in university teaching and school mathematics related to Klein’s thoughts, stemming from the last centur...

Handbuch der Mathematikdidaktik

By Hans Georg Weigand, Barbara Schmidt Thieme, Lisa Hefendehl Hebeker, Regina Bruder

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Didaktik der Geometrie Fur Die Sekundarstufe I

By Hans Georg Weigand, Andreas Filler, Sebastian Kuntze, Reinhard Holzl, Matthias Ludwig

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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.