Leroy Sachs Books

Algebra The University of Chicago School Mathematics Project

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Algebra

By Ted Widerski, Ernest Woodward, John W. McConnell, Zalman Usiskin, Susan Brown, Leroy Sachs, Daniel Hirschhorn, Sharon L. Senk, Lydia Polonsky, Margaret Hackworth

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PRE CALCULUS MATHEMATICS TEACHER RESOURCE BOOK

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Projects to enrich school mathematics, level 2

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An enrichment program for seventh, eighth, and ninth grade students studying such mathematical topics as "Microcomputer Programs," "Magic Squares," "Mathematics and Home Economics," "Pentominoes,"...

Projects to enrich school mathematics, level 3

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An enrichment program for high school students studying such mathematical topics as "Geometric Inversion," "Applications of the Microcomputer in Mathematics," "Mathematics of Flight," "Paradoxes in...

Student merit awards, high school

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Student merit awards, middle school

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An enrichment program for seventh and eighth grade students studying such mathematical topics as "Microcomputer Programs," "Magic Squares," "Mathematics and Home Economics," "Pi and Its History," a...

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.