Description Chapter 1. Observation and Imagination Chapter 2. Creative Mathematical Imagination Chapter 3. Finding Patterns to Solve Problems Chapter 4. Solid Figures Quiz Chapter 5. Rules of Remainders Chapter 6. Odd and Even Numbers Chapter 7. Number of Cases (Combinatorics) Chapter 8. Finding the Average Chapter 9. Effective Solution Strategies Chapter 10. The Nim Game Chapter 11. Rational Reasoning Chapter 12. Dividing and Combining Shapes Chapter 13. Repeating Patterns Chapter 14. Optimal Planning Chapter 15. Probability Chapter 16. New Operation Symbols Chapter 17. Counting Shapes Chapter 18. Chessboard Problems Chapter 19. Finding Defective Products Chapter 20. Rational Consumption Chapter 21. Various Problems Editor: Cmath Math Research Institute Recent Works: , , … 146 titles in total About: The Cmath Math Research Institute is composed of researchers passionate and talented in math education. Grounded in the academic nature of mathematics and a learner-centered educational philosophy, the institute researches and develops the best and most optimal math curricula and content to strengthen students' mathematical thinking skills. Cmath has led the way in math education by popularizing the concept of 'thinking math' through its own programs, as well as through the 'Gifted' program for gifted students, the '1031' math and science series, the '1031 Gifted Assessment,' the 'Sangwigwon 960' series, the 'Sangwigwon Yeongrihan Math' series, the 'Thinking Preschool Math' series, the 'Sangwigwon Math TenTen: Exploration and Problem Solving' series, and a wide range of multimedia math content.