Vincent F. O Connor Books

Mathematics in the toy store

By Vincent F. O Connor

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Color pictures using a toy store setting relate mathematics to the child's everyday world.

Mathematics in buildings

By Vincent F. O Connor

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Color pictures use structures and buildings to relate mathematics to the child's everyday world.

Mathematics in the kitchen

By Vincent F. O Connor

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Color pictures using a kitchen setting relate mathematics to the child's everyday world.

Mathematics at the farm

By Vincent F. O Connor

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Color pictures using a farm setting relate mathematics to the child's everyday world.

Mathematics in the circus ring

By Vincent F. O Connor

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Color pictures using a circus setting relate mathematics to the child's everyday world.

Mission Mathematics

By Vincent F. O Connor

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Mathematics on the playground

By Vincent F. O Connor

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Color pictures using a playground setting relate mathematics to the child's everyday world.

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.