Math Leads for Mathletes Book 2 is part of the Math Leads for Mathletes series, providing more challenging units for young math problem solvers and many others! The book draws on the authors' experience working with young mathletes and on the collective wisdom of mathematics educators around the world to help parents and mentors challenge and teach their aspiring math problem solvers. The topics contained in this book are best suited for middle schoolers, although students who discovered competitive mathematics in later grades will also benefit from the material. This book will help students advance in several directions important in competitive mathematics: algebra, combinatorics, geometry, and number theory. It presents a variety of problem solving strategies and challenges readers to explain their solutions, write proofs, and explore connections with other problems.