Roger Glass Books

More M&M's brand chocolate candies math
More M&M's brand chocolate candies math

By Barbara Barbieri McGrath

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Rhyming text and illustrations use candy to teach mathematical skills and concepts such as estimation, graph interpretation, division, multiplication, factoring, and problem solving.

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Saudades Revisited
Saudades Revisited

By Roger Glass

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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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