Description 1. Three-Digit Numbers 2. Various Shapes 3. Addition and Subtraction 4. Measuring Length 5. Classifying 6. Multiplication ▶ Main Workbook 1. Understanding Textbook Concepts The core textbook concepts are explained in detail, with practice problems designed to help students fully understand them. Supplementary explanations are placed alongside problems so students can recall and organize concepts while solving them, and related concepts from previous units or grades are included to reinforce connections. 2. Building Basic Skills Concept-focused practice problems help students build a solid foundation and prepare to strengthen their abilities. The workbook includes new-style problems reflecting the latest curriculum trends, including new-style descriptive (written-response) questions, so students can firmly build their basic skills. 3. Developing Application Skills True math ability comes from solving applied problems that build problem-solving skills. Carefully selected advanced problem types are provided for each unit, allowing students to complete their skills by repeatedly practicing advanced and similar problem types. 4. Unit Assessments To wrap up each unit, problems ranging from basic to applied levels are provided in two rounds (Round 1 and Round 2). Since these problems are selected based on frequently tested school exam questions, they can be used for regular assessments and school exam preparation. ▶ Skill-Reinforcement Workbook - Practice writing step-by-step to prepare for descriptive (written-response) questions. - Retake Round 1 and Round 2 unit assessments to check your skills once more.