Description Chapter 1. Solving Using Symmetry Chapter 2. Odd and Even Numbers Chapter 3. Estimation Chapter 4. Quick Calculation Chapter 5. Comparing Fraction Sizes Chapter 6. Logical Reasoning (1) Chapter 7. Cycles Chapter 8. Logical Reasoning (2) Chapter 9. Finding Patterns (1) Chapter 10. Finding Patterns (2) Chapter 11. Coloring Problems Chapter 12. Correspondence Chapter 13. Cutting Shapes Chapter 14. Changing Situations Chapter 15. Circular Track Problems Chapter 16. Proportion Problems Chapter 17. Greatest Common Divisor and Least Common Multiple Chapter 18. Percentage Problems Chapter 19. Finding Area by Moving Shapes Chapter 20. Unknowns Chapter 21. Quotients of Fractions Chapter 22. The Pigeonhole Principle Chapter 23. Various Calculation Methods Chapter 24. New Operation Symbols Chapter 25. Comprehensive Review Problems Compiled by: Cmath Mathematics Research Institute Recent Works: , , ... 146 titles in total About: The Cmath Mathematics Research Institute is made up of researchers with a passion and talent for math education. Grounded in the academic nature of mathematics and a learner-centered educational philosophy, the institute researches and develops the best and most effective 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 flagship 'Cmath' program, as well as the gifted-education program 'Gifted,' the published '1031' Math & Science series, the '1031 Gifted Aptitude Test,' the 'Sangwigwon 960' series, the 'Sangwigwon Yeongnihan Math' series, the 'Thinking Math for Preschoolers' series, the 'Sangwigwon Math TenTen: Exploring and Solving Problems' series, and a variety of multimedia math content.