David Costello Books

Here they come!

By David Costello

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When a group of frightening creatures holds a Halloween party in the woods, some costumed children give them a scare.

I can help

By David Costello

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All the animals jump in to help out, but somehow the problem does not get solved.

World of the Ant

By David Costello

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Little Pig Saves the Ship

By David Hyde Costello Author Illustrator

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Little Pig is back in Little Pig Saves the Ship! When the sea-faring pigs go a-sailing! Intrepid Little Pig — still the littlest pig in the family — is too little to go to summer c...

Little Pig Saves the Ship

By David Hyde Costello, Emily Eiden

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Making Math Stick

By David Costello

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Mathematizing Student Thinking

By David Costello

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Messing Around with Math

By David Costello

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I Can Do Math

By David Costello, Desiree Rossi

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Little Pig joins the band

By David Costello

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When Little Pig tries to join his Grandpa, brothers, and sisters in a marching band he discovers that, although he is too small for any of the available instruments, he can still play an important...

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.