Description: Sangwigwon Yeongrihan Math, a comprehensive critical-thinking math series designed to develop giftedness, is a serious thinking-skills workbook that cultivates the creativity, flexibility, and intuition that characterize gifted learners. Unlike textbooks or conventional thinking-skills problem sets, it offers fresh, fun, and life-related problems covering the full range of math topics. By organizing various types of thinking activities—observation, imagination, reasoning, and hands-on tasks—into clear stages and systems, children can easily take on and solve challenging problems. Chapter 1. Finding Differences and Similarities Chapter 2. Place Value Chapter 3. The Remainder Rule Chapter 4. Number Sequences (1) Chapter 5. Number Sequences (2) Chapter 6. Shopping Chapter 7. Thinking in Different Ways Chapter 8. Time, Distance, and Speed Chapter 9. Trump Card Math Chapter 10. Area Problems Chapter 11. Riddles (1) Chapter 12. Solving by Guess and Check Chapter 13. Solid Figures Chapter 14. Shifting Perspectives Chapter 15. Observing and Imagining Chapter 16. Reasoning Chapter 17. Various Cases Chapter 18. Clever Solutions Chapter 19. Observation and Math Chapter 20. Riddles (2) Chapter 21. Hands-On Math Chapter 22. Word Problems Editor: SiMath Math Research Institute Recent Works: , , ... 146 titles in total About: The SiMath Math Research Institute is composed of researchers with passion and talent for math education. Based on 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 learners' mathematical thinking skills. Through its efforts, the institute has led trends in math education by popularizing the concept of 'thinking-skills math' with its 'SiMath' program, as well as developing the gifted-education program 'Gifted,' the published series '1031' Math & Science, the '1031 Gifted Assessment,' the 'Sangwigwon 960' series, the 'Sangwigwon Yeongrihan Math' series, the 'Thinking Early Childhood Math' series, the 'Sangwigwon Math TenTen: Exploration and Solution of Problems' series, and a variety of multimedia math content.