Julie Ellis Books

What's Your Angle, Pythagoras?

By Julie Ellis Author Phyllis Hornung Illustrator

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Children can test their math skills and learn the Pythagorean Theorem alongside young Pythagoras in this STEM adventure.  Pythagoras’ curiosity takes him from Samos to Alexandria, where...

What s Your Angle Pythagoras A Math Adventure

By Julie Ellis

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Pythagoras and the Ratios

By Julie Ellis Author Phyllis Hornung Peacock Illustrator

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Julie Ellis and Phyllis Hornung Peacock team up once again to explore Pythagorean ratios in this humorous sequel to WHAT'S YOUR ANGLE, PYTHAGORAS?Pythagoras and his cousins want to win a music cont...

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.