Description FACTO (Free Active Creative Thinking O. Junior mathtian) FACTO is a junior mathematician who thinks freely, confidently, and creatively. This book is a creative thinking math exploration workbook designed for high-achieving students. It presents representative problem types across 180 key creative thinking topics, organized by subject area, helping students build problem-solving skills and critical thinking through hands-on practice. It also serves as an in-depth creative thinking workbook that can be used to prepare for various domestic and international math competitions, as well as gifted education programs affiliated with universities and regional education offices. 1) Organized by Representative Creative Thinking Topics at Each Level Each level is thoughtfully organized around key representative creative thinking topics, allowing students to encounter various approaches to each type of problem and explore them in depth. By presenting representative problem types for each key theme, students can understand underlying principles and systematically approach problems by following the flow of logical thinking. 2) Problem Type Analysis for Gifted Classes, Gifted Education Centers, and Competitions With the expansion of gifted education eligibility, this workbook is organized around representative problem types that frequently appear on gifted education center exams, helping students gradually prepare for gifted classes and gifted education centers. 3) Rich and Thorough Manual The manual provides detailed explanations for each problem and helps students grasp key points at a glance. Rather than simply solving problems and checking answers, students can study effectively and independently without missing any important points. 4) Diagnostic and Comprehensive Assessments Provided A diagnostic assessment available through the Mathtian website (http://www.mathtian.com) helps determine the appropriate level of the workbook for each student, while a comprehensive assessment after completing the workbook allows students to check their achievement. 5) Online Services Provided Through the Naver Cafe (http://cafe.naver.com/factos.cafe), a variety of creative thinking resources and learning information are continuously provided, including early childhood math learning methods, elementary math learning methods, past gifted education center exam questions, practice questions, video lectures, and Q&A. I. Numbers and Operations 01 Number Arrangement Puzzles 02 Cryptarithms 03 Four Fours II. Language and Logic 04 Number Puzzles 05 Nim Game 06 Strategy Games III. Shapes 07 Mirror Images 08 Combining Shapes 09 Folding and Overlapping Colored Paper IV. Patterns and Problem-Solving 10 Counting Patterns in Shapes 11 Sierpinski Triangle 12 Intersection Points and Regions V. Measurement 13 Perimeter of Plane Figures 14 Measurable Length and Weight 15 Broken Clocks VI. Numbers and Operations 01 Making Numbers with Number Cards 02 Grouping and Adding 03 Fractions VII. Language and Logic 04 Shape Analogies 05 Deduction Tables 06 Arrangements VIII. Shapes 07 Perpendicular and Parallel Lines 08 Tessellation 09 Folding and Angles IX. Number of Cases 10 One-Stroke Drawing 11 Number of Shortest Paths 12 Leagues and Tournaments X. Patterns and Problem-Solving 13 Making Assumptions 14 Roadside Trees and Logs 15 Calendars I. Number Sense 1. Simple Calculations 2. Sum of Numbers in a Number Table 3. Sum of Created Numbers 4. Maximum and Minimum of Sums and Differences 5. Parentheses 6. Cryptarithms II. Puzzles and Games 1. Nonograms 2. Magic Squares 3. Winning Strategies in Games 4. Matchstick Puzzles 1 5. Tangram Puzzles 6. Combining Shapes III. Geometry 1. Number of Trapezoids 2. Venn Diagrams with Quadrilaterals 3. Drawing Squares 4. Number of Squares 5. Finding Patterns to Count Shapes 6. Number of Triangles Formed by Connecting Points IV. Finding Patterns 1. Shape Analogies 2. Patterns 3. Patterns in the Number of Shapes 4. Number Sequences 5. Arrow Rules 6. Intersection Points and Regions V. Measurement of Shapes 1. Parallelism and Angle Size 2. Sum of Interior Angles of Polygons 3. Interior Angle of a Regular Polygon 4. Tessellation 5. Paper Folding 6. Clocks and Angles 4. Author VI. Number Theory 1. Ancient Numbers 2. Making Numbers 3. Large Numbers 4. Number of Digits 5. Conditions and Numbers 6. Mirror Numbers VII. Logical Reasoning 1. Properties of Odd and Even Numbers 2. One-Stroke Drawing 3. Deduction Tables 4. Arrangements 5. Solving by Assumption 6. Taking Socks from a Drawer VIII. Spatial Sense 1. Finding Pieces 2. Moving Shapes 3. Finding Same and Different Shapes 4. Overlapping Colored Paper 5. Folding Colored Paper 6. Shapes Made by Folding and Cutting IX. Counting 1