Description: Sangwigwon Yeonsan 960 approaches the study of numbers and operations—the starting point of math and an essential tool across all areas—with a new philosophy and methodology. Through task-based number and operation problems combined with various situations, processes, and methods, this workbook not only builds strong computation skills but also nurtures higher-level mathematical thinking. B4 (Units 661–720): Chapter 1 - Understanding the Multiplication Table; Chapter 2 - Multiplication Practice; Chapter 3 - Multiplying Three Numbers and Finding Multiplication Patterns; Chapter 4 - Multiplication with Addition and Subtraction; Answer Key