Description 1. Addition and Subtraction 2. Plane Figures 3. Division 4. Multiplication 5. Length and Time 6. Fractions and Decimals ▶ Main Workbook 1. Mastering Concepts Key textbook concepts are explained in detail, with concept-check problems included to help students fully understand what they've read. Practice problems are also provided on the facing page so students can immediately check their understanding. 2. Building Basic Skills Focused problems for each concept help strengthen fundamentals and prepare students to build real skills. Solve every type of problem needed for a solid foundation, from textbook and workbook problems to descriptive and creative-thinking questions. 3. Developing Applied Problem-Solving Skills True math ability comes from developing problem-solving skills through applied questions. Complete your mastery by solving representative applied problems for each unit. 4. Unit Assessments To help wrap up each unit, problems ranging from basic to applied levels are included. These also feature carefully selected questions that commonly appear on school tests, making this section ideal for preparing for regular assessments and school exams. ▶ Skill-Building Supplement - Practice step by step, starting with guided writing exercises, to prepare for descriptive-answer questions. - Review unit assessment problems once more for extra practice.