Description Sagosem Elementary 1st Grade Vol. 1 (2019) Week 1. Making Addition with 10 Week 2. Sum of Two Numbers Week 3. Addition with a Blank (□) Week 4. Sum of Three Numbers Week 5. Addition with Sentences Week 6. Partial Addition Week 7. Addition Problem Solving (1) Week 8. Addition Problem Solving (2) Sagosem Elementary 1st Grade Vol. 2 (2019) Week 1. Subtracting from Teen Numbers Week 2. Subtraction with a Blank (□) Week 3. Difference of Two Numbers Week 4. Addition and Subtraction Facts (1) Week 5. Addition and Subtraction Facts (2) Week 6. Addition and Subtraction of Three Numbers Week 7. Problem-Solving Calculations Week 8. Addition and Subtraction with Sentences Sagosem Elementary 1st Grade Vol. 3 (2019) Week 1. Numbers up to 100 Week 2. Number Order and Skip Counting Week 3. Comparing Number Size Week 4. Number Charts Week 5. Making Numbers Week 6. Conditions and Numbers Week 7. Numbers up to 1000 (1) Week 8. Numbers up to 100 (2) Sagosem Elementary 1st Grade Vol. 4 (2019) Week 1. (Two-Digit Number) + (One-Digit Number) Week 2. Problem-Solving Addition (1) Week 3. Addition of Two-Digit Numbers Week 4. Problem-Solving Addition (2) Week 5. (Two-Digit Number) - (One-Digit Number) Week 6. Subtraction of Two-Digit Numbers Week 7. Problem-Solving Subtraction Week 8. Addition and Subtraction of Two-Digit Numbers