Helene Silverman Books

Your Days Are Numbered in Calendar Math
Your Days Are Numbered in Calendar Math

By Helene Silverman, Sheila Siderman

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"Early math concepts and number computaion are closely tied together in this sequential, eleven chapter book for teaching the calendar."

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Kid s Book of Metrics
Kid s Book of Metrics

By Helene Silverman

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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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