★From a Korea Mathematics Education Award–winning teacher with 20+ years of teaching experience, this story-driven mix of math puzzles and adventure makes kids think, “Wait—math can be fun!”

Matt has a name that sounds a lot like math, but unfortunately, he’s terrible at it!

Matt has always struggled with numbers and formulas, and his classmates tease him for having a “math name” he can’t live up to. Matt decides there’s only one solution: he’s going to change his name. But along the way, Matt encounters strange questions, unexpected puzzles, and an unforgettable notebook that once belonged to his grandmother. As he works through these mysteries and challenges, he begins to discover a different side of math—one that has nothing to do with memorizing formulas and everything to do with thinking, asking questions, and noticing patterns in everyday life.

This unique book is more than just a story. It’s a novel filled with interactive math puzzles and logic problems that invite young readers to think, explore, and play with ideas the fun of math without feeling like they’re in class. Written by an award-winning math teacher and author, this book blends fiction and learning into a story that makes math feel natural, playful, and even exciting. This is a perfect book for young readers who think they don’t like math—or haven’t yet discovered what makes it interesting.

Kim Sang-mi is a writer and math educator with over 20 years of classroom experience. She’s known for combining logic and creativity in ways that help students enjoy math and see it as part of real life. In 2024, she received the Korea Mathematics Education Award. Her other works include Pi-Miro, Transfer Student Io and the Secret of the Math Genius, etc. Q.E.D.