Greg Roza Books

The Game of Chess
The Game of Chess

By Greg Roza

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Heads or tails?
Heads or tails?

By Greg Roza

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Where we play sports
Where we play sports

By Greg Roza

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Discusses how to measure the perimeters of various types of playing fields, such as football and soccer, by using addition and multiplication.

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Geometry
Geometry

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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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