This textbook has been newly published to reflect the 2022 revised curriculum, effective from 2024. 1. Ten problems solved with the mind build real math skills better than a hundred problems solved by hand. Operations training that only teaches calculation methods can build 'computation skill,' but it doesn't necessarily lead to true 'math ability.' Just as calculations have principles and methods, each calculation has its own properties and relationships to other calculations. Children also need to be able to apply calculations and develop number sense through them. To enable well-rounded, multi-dimensional practice rather than a single-faceted approach, this book is designed with mathematically grounded problems that allow children to think about each operation from various angles. 2. Elementary, middle, and high school math come together only when operations are taught with real mathematical meaning, not just the four basic arithmetic operations. Since math is a continuous subject connecting elementary, middle, and high school, the concepts formed in elementary school directly affect learning in later years. Concepts learned in elementary school may seem simple, but they connect to important ideas in middle and high school, making it essential to learn operations in a way that highlights their mathematical meaning. This book also introduces mathematical rules learned in middle and high school at an elementary level, helping to anchor the foundation of a child's overall math learning. 3. Math concepts stick only when children think, solve, and truly feel them. Operations training that is calculation from start to finish can bore children and cause them to miss the mathematical meaning behind the calculations. This book creates a multi-dimensional learning structure that helps children understand the mathematical principles behind each calculation method, connecting computation practice to genuine conceptual understanding. The answer key also includes explanations of why the math concepts in each problem are important and how they connect to middle and high school learning. Table of Contents: 1. Basics of Multiplication 2. Multiplication Tables of 2 and 5 3. Multiplication Tables of 3 and 6 4. Multiplication Tables of 4 and 8 5. Multiplication Tables of 7 and 9 6. Comprehensive Multiplication Tables 7. Applying Multiplication Tables