Lawrence S. Leff Books

Geometry the easy way
Geometry the easy way

By Lawrence S. Leff

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Explains the principles of plane geometry and includes practice exercises and model problems.

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Barron's math workbook for the SAT I
Math A
Math A

By Lawrence S. Leff

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Barron s Regents Exams and Answers
Let s Review
Let s Review

By Lawrence S. Leff

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Let s Review
Let s Review

By Lawrence S. Leff

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Barron's math workbook for the new SAT
PreCalculus the Easy Way
PreCalculus the Easy Way

By Lawrence Leff

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Let s Review
Integrated Algebra
Integrated Algebra

By Lawrence S. Leff M.S.

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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.

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