Class 7 Math: Comparing Quantities Quick Revision Chapter Summary

Need to review the entire chapter before a test? This quick revision guide summarizes all the core concepts, topics, and equations taught in Class 7 Comparing Quantities to help you refresh your memory instantly.

Core Topics At a Glance

### 📌 Percentages conversions Percentages represent fractions out of 100. Convert fractions or decimals to percentages by multiplying by 100.

### 📌 Finding percentages of quantities Finding a specific percentage portion of a total value (e.g. 15% of 200 is 30).

### 📌 Use of percentages: Profit and Loss percentage Profit or loss percentage is calculated relative to the Cost Price (CP).

### 📌 Simple Interest calculations Simple Interest (SI) is calculated on the principal amount for a given rate of interest and time.

Key Formulas Mind Map

• Profit Percentage: `\%P = \frac{\text{Profit}}{\text{CP}} \times 100` - Profit margin relative to cost price....
• Simple Interest: `SI = \frac{P \times R \times T}{100}` - Simple interest formula....

Revision Checklist

1. Review the subtopic guides and outline notes.
2. Practice writing the key formulas from memory.
3. Solve at least 3 worked examples and check your steps.
4. Take a timed practice quiz to verify your speed.