Description: This workbook has been newly published to reflect the revised 2022 curriculum, effective from 2024. 1. Ten problems solved with the mind matter more for math skill than a hundred problems solved by hand. Calculation practice that only teaches computation methods can build 'computation skill,' but it doesn't necessarily lead to true 'math skill.' Just as there are principles and methods behind calculation, each type of calculation has its own properties, and there are relationships between different calculations. Children also need to be able to apply calculations and develop number sense through them. To enable well-rounded calculation training rather than just a single dimension of practice, this book presents problems that allow children to think about each calculation from various angles, all based on solid mathematical design principles. 2. Only when calculation is taught with real mathematical meaning—not just as the four basic operations—can elementary, middle, and high school math truly connect. Since math is a subject that flows continuously from elementary through middle and high school, the concepts formed in elementary school directly affect learning in later years. While elementary concepts may seem simple, they are closely connected to important ideas in middle and high school math, making it essential to study calculation in a way that highlights its mathematical meaning. This book also lets children experience, at an elementary level, the mathematical principles they'll encounter in middle and high school, helping to anchor their overall math learning. 3. Math concepts stick only when children think, solve, and truly feel them. Calculation practice that focuses solely on repetitive computation 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 method, connecting calculation practice to genuine concept understanding. The answer key also includes special notes explaining why the math concepts in each problem matter and how they connect to middle and high school learning. Contents: 1. Division of proper fractions with the same denominator 2. Division of proper fractions with different denominators 3. (Whole Number) ÷ (Fraction) 4. Division of mixed numbers 5. Mixed operations with fractions 6. Division of decimals with no remainder 7. Division of decimals with a remainder 8. Mixed operations with decimals 9. Expressing as a simple ratio of whole numbers 10. Proportional expressions 11. Proportional distribution