Description Sagosem Elementary 4 Vol. 1 (2019) Week 1. Addition of Fractions Week 2. Subtraction of Fractions Week 3. Calculations with Whole Numbers and Fractions Week 4. Addition and Subtraction of Fractions Week 5. Addition of Mixed Numbers Week 6. Calculations with Whole Numbers and Mixed Numbers Week 7. Subtraction of Mixed Numbers Week 8. Addition and Subtraction of Mixed Numbers Sagosem Elementary 4 Vol. 2 (2019) Week 1. Mixed Addition and Subtraction Week 2. Mixed Multiplication and Division Week 3. Mixed Addition, Subtraction, and Multiplication Week 4. Mixed Addition, Subtraction, and Division Week 5. Mixed Addition, Subtraction, Multiplication, and Division Week 6. Various Mixed Calculations Week 7. Calculation Puzzles Week 8. Mixed Calculations with Parentheses Sagosem Elementary 4 Vol. 3 (2019) Week 1. Two- and Three-Digit Decimal Numbers Week 2. Relationships Between Decimals Week 3. Comparing the Size of Decimals Week 4. Addition of Decimals with the Same Number of Digits Week 5. Addition of Decimals with Different Numbers of Digits Week 6. Subtraction of Decimals with the Same Number of Digits Week 7. Subtraction of Decimals with Different Numbers of Digits Week 8. Calculations with Decimals Sagosem Elementary 4 Vol. 4 (2019) Week 1. At Least, At Most, More Than, Less Than Week 2. Number Lines and Ranges Week 3. Range of Numbers Week 4. Rounding Up and Rounding Down (1) Week 5. Rounding Up and Rounding Down (2) Week 6. Rounding Week 7. Finding the Range of a Number Week 8. Applying Estimation