3. Addition

4. Subtraction

7. Division

10. Patterns

11. Rounding Numbers

12. Fractions

12.4. Division as Fraction

12.5. Fraction as Division

12.7. Equivalent Fractions

12.8. Comparison of Fractions

12.10. Unit Fraction

13. Decimals

14. Money

15. Measurement

16. Unitary Method

17. Geometry

20. Symmetry

21. Time

22. Data Handling