Description: This workbook goes beyond textbook-level concepts to cover practical application concepts, critical thinking concepts, and concepts that connect to future learning, helping children understand curriculum content from a mathematical perspective. The difficulty and arrangement of problems are strategically designed to guide children toward top-level performance, allowing anyone to challenge themselves to reach the top ranks. The explanations have also been improved with the detailed, differentiated approach unique to Choisangwi, making it easier for parents to guide their children without difficulty. The book also includes unit-by-unit competition-level problem sets and assessments designed to build the kind of critical thinking skills needed for the CSAT, allowing children to develop mathematical thinking from an early grade. 1. Numbers up to 100 2. Addition and Subtraction (1) 3. Various Shapes 4. Addition and Subtraction (2) 5. Telling Time and Finding Patterns 6. Addition and Subtraction (2)