Description 1. Four-Digit Numbers 2. Multiplication Tables 3. Measuring Length 4. Time and Clock Reading 5. Tables and Graphs 6. Finding Patterns Feel math! This is another must-read book on the path to becoming a top-tier student. Choisangwi Math S helps children develop an intuitive feel for and understanding of math so they can solve any problem, building the strength needed to stay ahead all the way through middle and high school. By reviewing not only textbook concepts but also advanced concepts, children gain a solid foundation for in-depth learning, and through visual images they can intuitively grasp the core of advanced concepts. In addition, the difficulty level and problem composition reflect the new curriculum, strengthening academic competencies and helping every child work their way up to the top level. With a companion review book that matches 1:1 with the problems in the main text, children can repeatedly practice and build advanced mathematical thinking skills from an early age. 〈Main Content〉 ✐ Basic Concept Covers not only textbook concepts but also advanced concepts and concepts connecting to later grades, with problems for each concept to build a solid foundation for advanced learning. ✐ Choisangwi [S] Through a combination of 'one sentence + image,' children intuitively feel and understand the algorithm and core concept behind solving advanced problems. Based on this understanding, they solve similar problems to firmly build top-tier skills. ✐ Math Master Beyond the representative advanced problem types, children tackle a variety of advanced and competition-level problems, challenging themselves to reach the top 3%. 〈Special Supplement〉 A companion review section is included so that all representative problem types from the main text and Math Master section can be reviewed 1:1.