- Percentages, Fractions and Decimals
- Expressing one Quantity as a Percentage of Another
- Finding the Percentage of a Number
- Comparing Two Quantities by Percentages

- Concept of Ratio
- Problem 1: Concept of Ratio
- Properties of Ratio
- Problem 1: Properties of Ratio
- Problem 2: Properties of Ratio
- Duplicate Ratio
- Problem 1: Duplicate Ratio
- Transitive Property of Ratio
- Problem 1: Transitive Property of Ratio
- More on properties of Ratio
- More on properties of Ratio
- Equivalent Ratios
- Increase and Decrease in Ratio

- Introduction to Proportion
- Problem 1: Introduction to Proportion
- Direct Proportions
- More on Direct Proportion
- Inverse Proportion
- More on Inverse Proportion