Description 1. Three-Digit Numbers 2. Various Shapes 3. Addition and Subtraction 4. Measuring Length 5. Classification 6. Multiplication Feel math! This is another essential book on the path to becoming a top-tier math student. Choisangwi Math S helps children build the ability to solve any problem through a true feeling and understanding of math, laying the foundation to stay at the top of their class all the way through middle and high school. By exploring not only textbook concepts but also advanced concepts, children can build a solid foundation for deeper learning, and through visual images, they can intuitively grasp and understand the core of advanced concepts. In addition, reflecting the new curriculum, the book strengthens core academic skills and is carefully leveled in difficulty so that any student can challenge themselves to reach the top level. With a companion review book that matches 1:1 with the problems in the main text for repeated practice, this series helps children build top-level mathematical thinking skills starting from the early grades.