Cambridge questions are written in precise mathematical English. If you know exactly what product, difference, justify and estimate ask you to do, you will not lose marks answering the wrong question.
| Term | What it means | Example |
|---|---|---|
| per cent | Out of a hundred. | 45% is 45 out of 100. |
| percentage | A number written as a part of 100. | 35%. |
| equivalent | The same value in a different form. | 1/2 = 0.5 = 50%. |
| convert | Change from one form to another. | 0.35 → 35%. |
| simplest form | No common factor except 1. | 45/100 = 9/20. |
| of | In percentage work, “of” means multiply. | 20% of 50 = 10. |
| increase | Make larger by adding the percentage. | 200 + 15% → 230. |
| decrease | Make smaller by subtracting the percentage. | 200 − 15% → 170. |
| percentage change | The change as a percentage of the original. | 40 → 50 is 25% up. |
| original amount | What you started with. | You divide by it. |
| discount | An amount taken off a price. | 25% off $80 is $20 off. |
| profit | The amount gained above what was paid. | Sold for more than cost. |