6. Probability
9. Percentage
10. Profit and Loss
14. Mensuration
14.1. Standard Units of Area
14.2. Area and Perimeter
14.2.1. Area and Perimeter of a Square
14.2.3. Area of 4 Walls of a Room
14.2.4. Area between Two Rectangles
14.2.5. Area and Perimeter of Triangles
14.2.9. Area of a Trapezium
14.2.10. Area of Polygon
14.2.10.1. Area of Irregular Polygons
14.2.10.2. Area of Regular Polygons
14.3. Volume and Surface Area
17. Time and Work
18. Factorization