Description [Composition and Features] (1) The standard study period for one volume is 1 month. Week 1, which covers basic calculation principles, consists of 6 pages per day, while Weeks 2-4, which build thinking skills based on those principles, consist of 4 pages per day. (2) To help children smoothly progress through Weeks 2, 3, and 4, a "Calculation Skills Check" section is included at the end of Week 1, allowing children to confirm and reinforce their understanding of the basic concepts learned that week. (3) The difficulty level is designed to gradually increase in the order of "Week 1 → Week 2 → Week 3 → Week 4" within each volume, "Day 1 → Day 2 → Day 3 → Day 4 → Day 5" within each week, and "Page 1 → Page 2 → Page 3 → Page 4" within each day. (4) To support children's self-directed learning, the books include activity stickers, activity sheets, intuitive examples, and various helpful hints. (5) Bonus 1: Math Board Game Each volume includes one math board game, allowing parents and children to enjoy playing together while reinforcing the basic calculation principles from Week 1. Rather than being a repetitive drill workbook, this fun math board game helps improve both accuracy and speed in calculation. (6) Bonus 2: Praise Stickers Recognizing that children can easily lose motivation, a space for a "Praise Sticker" is provided in the bottom right corner of the last page of each day's lesson to encourage continued learning. Instead of a single generic phrase like "Well Done!", the praise stickers come in three levels—"Excellent!", "Well Done!", and "Keep Trying! You Can Do It!"—to match the child's achievement. (7) Bonus 3: Math Champion Award An award certificate is included at the end of each volume to motivate children to move on to the next one. When parents offer generous praise and enthusiastic applause along with the certificate, children can build genuine confidence in math. (8) The Mathtian website (http://www.mathtian.com) offers a variety of learning materials, including: 1) Supplementary calculation practice problems 2) Thinking skills calculation activity sheets (9) The Facto Cafe (http://cafe.naver.com/factos) provides a wealth of information and resources related to math education, including: - Free video lectures on Creative Thinking Math Facto - Q&A related to published workbooks - Preparation materials for gifted education programs (past exam questions, practice questions) - Elementary math tips and Q&A