1. A workbook that collects only the essence of advanced elementary math. "Open Advanced Elementary Math," a collection of essential advanced math types essential for elementary school students, with a focus on middle school relevance. (1) 3rd grade - 1st grade http://www.yes24.com/Product/Goods/11... (2) 3rd grade - 2nd grade http://www.yes24.com/Product/Goods/11... (3) 4th grade - 1st grade http://www.yes24.com/Product/Goods/11... (4) 4th grade - 2nd grade http://www.yes24.com/Product/Goods/11... (5) 5th grade - 1st grade http://www.yes24.com/Product/Goods/11... 2. Mathematical Thinking Fairy Tales for Elementary School Students Naturally learn math while reading fairy tales. A book that makes children approachable and love math. "Children in a Suspicious Math Prison" http://www.yes24.com/Product/Goods/11... 3. "This is how children who are good at math study": A practical edition Provides specific math study methods and methods for mom-style in-depth study. 2022 Aladdin Book of the Year Nominee "In-depth Study Methods for Elementary Math" http://www.yes24.com/Product/Goods/10... 4. A book that provides a comprehensive roadmap for studying math. Selected as the 2021 Yes24 Book of the Year "This is how children who are good at math study." http://www.yes24.com/Product/Goods/97... 5. A workbook that summarizes elementary concepts essential for middle school math. "Elementary Math in One Book" End" http://www.yes24.com/Product/Goods/10... 6. Non-face-to-face class website http://soojal.com/default/