The Monster School Park organized a field trip for the little monsters. They took the school bus to a farm in the suburbs. As everyone gathered around to see the cows milking, Ah Mai and Ah Si snuck out. They went to the gate of the breeding circle and wanted to see the other animals inside. They just met the headmaster... This book introduces the relevant knowledge of keeping chickens and rabbits in the same cage by telling the interesting stories of the little monster Ah Mai and Ah Si in the process of their research and study trip, so that children can learn mathematics knowledge and cultivate Mathematical Olympiad thinking in the process of reading stories. After the book, there are also expanded reading and small exercises. The combination of learning and practice can expand children's mathematical vision and consolidate children's mastery of knowledge.