This is a fantastic comic series by the well-known math teacher Ao De, aiming to show children the underlying thinking behind math knowledge. Seven major topics—symbols, units, addition and subtraction, multiplication and division, and splitting—are discussed in five volumes of the book, unveiling the nature of math through hilarious fantasy stories and impressive comics. With four stories in each volume, this series interweaves the 20 fantasy stories into the hero and his friends; adventure in the world of thinking. From time travel to high technology, from entertaining dialogues to lively characters, this series is able to offer readers an unforgettable movie-like reading experience.