Description Sago-Sem Elementary 2 Book 1 (2019) Week 1. (Two-digit number) + (One-digit number) Week 2. Word Problem Addition Week 3. Addition of Three Numbers Week 4. (Two-digit number) - (One-digit number) Week 5. Word Problem Subtraction Week 6. Addition and Subtraction Week 7. Word Problems Week 8. Word Problem Solving in Arithmetic Sago-Sem Elementary 2 Book 2 (2019) Week 1. Addition of Two-Digit Numbers (1) Week 2. Addition of Two-Digit Numbers (2) Week 3. Subtraction of Two-Digit Numbers (1) Week 4. Subtraction of Two-Digit Numbers (2) Week 5. Addition and Subtraction of Two-Digit Numbers Week 6. Various Calculation Methods Week 7. Expressing as Equations Week 8. Word Problem Solving in Arithmetic Sago-Sem Elementary 2 Book 3 (2019) Week 1. Multiplication Equations 2-5 Week 2. Multiplication Tables 2-5 Week 3. Multiplication Equations 6-9 Week 4. Multiplication Tables 6-9 Week 5. Multiplication Tables (1) Week 6. Multiplication Tables (2) Week 7. Multiplication Problem Solving (1) Week 8. Multiplication Problem Solving (2) Sago-Sem Elementary 2 Book 4 (2019) Week 1. Division Week 2. Relationship Between Multiplication and Division Week 3. Division Tables (1) Week 4. Division Tables (2) Week 5. Division with a Missing Number (□) Week 6. Division Problem Solving Week 7. Multiplication and Division Week 8. Multiplication and Division Word Problems