7. Fractions
8. Decimals
10. Rounding
12. Percentage
13. Unitary Method
14. Measurement
15. Time
16. Money
17. Geometry
17.2. Angles
17.4. Shapes and Curves
17.5. Triangles
17.6. Circles
17.6.2. Center of a circle
17.6.3. Radius and diameter of a circle
17.6.4. Circumference of a circle
17.6.6. The concept of a semi-circle
17.6.7. Chords of a circle
17.6.8. Arcs in a circle
17.7. Area and perimeter
17.8. Solids
18. Data Handling