Description: Top-Tier Math Operations 960 approaches number and operations learning—the starting point of mathematics and an essential tool across all math areas—with a new philosophy and methodology. Through task-solving arithmetic problems combined with diverse situations, processes, and approaches, this workbook not only perfects computation skills but also develops higher-order mathematical thinking. Top-Tier Math Operations 960 will be a great support for children who get bored or tired of simple repetitive arithmetic practice, children who need creative and analytical arithmetic learning beyond the basics, children aiming for in-depth application of curriculum concepts, children who need to think through math rather than mechanically solve problems, children who want to build a solid foundation rather than rush into excessive advanced learning, children preparing step by step from an early grade for gifted education programs, math olympiads, or specialized schools, and any child who loves math and wants to excel at it. [Book Composition] 6 books for Level P, 4 books each for Levels A–D, 22 books in total - D1: 961–1020, Multiplication and Division - D2: 1021–1080, Mixed Calculations - D3: 1081–1140, Addition and Subtraction of Fractions - D4: 1141–1200, Addition and Subtraction of Decimals [Recommended Grade] Essential thinking-skills arithmetic workbook for top-performing 4th grade elementary students [Table of Contents] D2: 1021–1080, Mixed Calculations - Issue 1: Mixed calculations of addition/subtraction and multiplication/division - Issue 2: Mixed calculations of addition, subtraction, and multiplication - Issue 3: Mixed calculations of addition, subtraction, and division - Issue 4: Mixed calculations with ( ) and { } - Answer Key