Modultown!
Experience mathematics like never before in a whimsical puzzle hunt through the exciting Modultown! It is a fiction book for children ages 9-14 and the young at heart. Lovers of math, puzzles, or fantasy adventures alike will delight in this journey of problem-solving and friendship. Playing in Modultown unlocks pathways into number theory, computer science, genetics, and other essential modern fields.
Questions? Author requests? Book tour ideas? Contact us.
PRE-ORDER the book here – release planned for May 2026
You will receive your book when it comes out. We will let you know by email when that happens.
PRE-ORDER beautiful paperback for your learning library. $28 $22 It comes with ePub and PDF files of the book.
PRE-ORDER electronic book for all your devices. $8 You get ePub and PDF files of the book, DRM-free.
This book has an open license under Creative Commons. You can get the PDF at the price you name. Type the amount (from zero to infinity):
Big discounts for small bundles – with any titles
Mathematics works so much better with others! Buy together with friends, your class, math circle, or fundraiser – or treat yourself to a bundle of titles. You save on book price and shipping.
- $19 each book when you buy 2-4 books
- $16 each book when you buy 5+ books
Mix and match different Natural Math books for this offer.
Ebook discount is $3 off each ebook when you buy two or more.
Add the books to your cart. The discounts will apply automatically.
140+ backers crowdfunded Modultown in the fall of 2025 to bring it to life. Thank you! Check out this book trailer to meet the authors and see student Moduli fanart.
Welcome to Modultown!
Experience mathematics like never before in a whimsical puzzle hunt through the exciting Modultown! This is a sequel to a beloved adventure book (which can be read independently) with new characters to meet and new math powers to gain!
Modultown is a place where history repeats itself … but friends learn and grow along the way. Each inhabitant of Modultown is driven by an inner cycle that is reflected in their number of hands as well as their sleep patterns. When human siblings Emmy and Leo find themselves magically transported to this world, they adapt to its natural rhythms and make friends by joining a team puzzle competition. The team must combine their different perspectives to solve challenges that flesh out the mechanics of modular arithmetic.
Grab a Sample Chapter
Check out a sample chapter of the story, Meet Quintessa.
Math storytelling? Why?
By personifying math through relatable characters in magical worlds, we show kids that math is alive and much more than a formula on a page. Mathematics is a language describing human phenomena and a canvas for creativity.
Just like the stories we love, many great inventions of mathematics start with a desire to express something in our world or to create fantastic worlds of our own. We believe that math and stories are complementary tools for building human understanding, transferring knowledge, and ingraining concepts in memory. We believe that every child has a math story to tell.
Meet the Team
Sasha Fradkin has loved math from an early age, and seeks to share that love with others. After receiving her PhD in mathematics from Princeton University, she worked for several years as a professional mathematician. Currently, Sasha is the Dean of STEM at the Main Line Classical Academy, a private school in Bryn Mawr, PA, where she develops the math curriculum. Since she started at MLCA, Sasha has taught math at every level from Kindergarten math through Calculus. In addition to working at MLCA, Sasha teaches enrichment math to children ages 8–15 at Golden Key Enrichment and teaches at several middle-school math camps over the summer. She enjoys math adventures with her two daughters and pondering exciting and engaging ways to present the beauty of mathematics to children.
Allison Bishop grew up with a passion for writing, and initially disliked math because it was presented as formulaic. She belatedly discovered the creative side of mathematics and science, and now sees it as a vital component of the curiosity that drives her life. She is currently the co-founder and President of Proof Trading, as well as a visiting professor of computer science at City College, CUNY. She has a PhD in computer science from the University of Texas at Austin, and is currently serving as the Vice President of the International Association for Cryptologic Research (IACR). She remains an avid fiction enthusiast and writer, and is always seeking new ways to expose young minds to creative mathematical thinking and fuel their scientific curiosity. She is also a trained sketch and stand up comedian.
Mark Gonyea, the book’s illustrator, is a graphic artist, author, and tabletop game creator. A graduate of The Joe Kubert School of Cartoon and Graphic Art, Mark found his first job as graphic artist for the comic magazine Heavy Metal. In 2005, with nearly a decade in graphic design behind him, he made the leap to writing and illustrating children’s books full time. His best-known books include A Book About Design, The Spooky Box, and One Little Monster. When not contemplating his next kids book or latest game, Mark spends his free time watching movies and playing video games. He hopes one day to get a dog.
Meet the Publisher
At the Natural Math Alliance, we believe that a good world is possible with better mathematics. Together with children, parents, teachers, and organizers, we help everyone grow a happy familiarity with all sixty-plus mathematics subjects as math makers. To match these goals, we developed a unique publishing process, giving authors, artists, and even readers a lot of creative control.
A book starts with amazing authors who deeply care about mathematics and learning. Each author spends many hours improving every aspect of the manuscript by testing the book with children, families, and classes.
Next comes our Future Book Club: the brave volunteers who field-test the draft in their own families, classes, math circles, book clubs, museum groups, and other programs. They come from all learning backgrounds and all continents (except Antarctica, so far), making Natural Math books more community-responsive and real.
Crowdfunding comes next. Thank you!
Our crew of professional editors, proofreaders, and designers are paid with the crowdfunding money. They make the book a joy to hold, each page or eBook screen a smooth reading experience. Natural Math books have been featured by The Atlantic, The NY Times, and many lovely sites dedicated to learning, parenting, and mathematics.
As with all our previous books, Modultown! is published under a Creative Commons license. That means that people all over the world will be able to access its content, translate it into different languages—and share their ideas based on the book. The Creative Commons site features an interview with the Natural Math founder in its celebration of innovative projects in education.
If you are a part of the Natural Math community, thank you for your continuing support. If you are new to Natural Math, welcome to the adventure!
Modultown! Events and Materials
Want to invite Moduli to your math circle, class, event, or home? Use these materials or contact us for help!
November 2025, Triangle Math Teachers’ Circle – Puzzle Hunt at the NC Zoo (printable PDF)
September – October 2025 Math Storytelling Day student circles at UNC CH, Durham Academy, and Orlando MC (editable slides)
August 2025 Math Makers @ Cuboid (editable slides, recording)
