Greg Tang Books

Ready, Set, Hop!
Ready, Set, Hop!

By Stuart J. Murphy

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Quack and Count
Quack and Count

By Baker Keith

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Seven ducklings take a rhyming look at addition

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The Grapes Of Math
The Grapes Of Math

By Gregory Tang

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The Grapes Of Math: Mind Stretching Math Riddles
The Grapes Of Math: Mind Stretching Math Riddles

By Greg Tang, Jo Ellen Bogart, Carlos Freire

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Margo's having a birthday party and she invites ten friends to join her in the celebration. On the day of her party, five of her guests show up right on time; four others are a quarter of an hour l...

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Math for All Seasons
Math for All Seasons

By Greg Tang

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Math For All Seasons: Mind-Stretching Math Riddles
The Best Of Times
The Best Of Times

By Greg Tang, Gregory Tang

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Simple rhymes offer hints on how to multiply any number by zero through ten without memorizing the multiplication tables.

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Math Appeal Mind Stretching Math Riddles
Math-terpieces: The Art of Problem-Solving
Math-terpieces: The Art of Problem-Solving

By Greg Tang

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A series of rhymes about artists and their works introduces counting and grouping numbers, as well as such artistic styles as cubism, pointillism, and surrealism.

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Math-terpieces
Math-terpieces

By Greg Tang

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A series of rhymes about artists and their works introduces counting and grouping numbers, as well as such artistic styles as cubism, pointillism, and surrealism.

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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.

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