Description Sangwigwon Yeonsan 960 approaches number and operations learning—the starting point of math and an essential tool across all areas—with a new philosophy and methodology. Through task-solving type number and operations problems combined with a variety of situations, processes, and formats, this series not only completes computation skills but also builds higher-level mathematical thinking ability. Sangwigwon Yeonsan 960 will be a great help for children who get bored or tired of simple repetitive computation drills, children who need creative thinking-based computation learning beyond basic arithmetic, children who want to deepen and apply their curriculum-based computation skills, 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, olympiads, or specialized/international middle and high schools, and indeed all children who love math and want to excel at it. [Book Composition] 6 books in the P level, 4 books each in levels A–D, for a total of 22 books C1: 721–780 — Addition and subtraction of three- and four-digit numbers C2: 781–840 — Multiplication C3: 841–900 — Division C4: 901–960 — Fractions and decimals [Recommended Grade] An essential thinking-skills computation workbook for top-performing elementary 3rd grade students Table of Contents C2: 781–840 Multiplication Issue 1: Multiplication of two-digit numbers by one-digit numbers (1) Issue 2: Multiplication of two-digit numbers by one-digit numbers (2) Issue 3: (Three-digit number) × (One-digit number), (Two-digit number) × (Two-digit number) (1) Issue 4: (Three-digit number) × (One-digit number), (Two-digit number) × (Two-digit number) (2) Answer Key Included