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Percentages are tested extensively throughout the Edexcel GCSE Mathematics (1MA1) specification. You need to be confident with finding percentages of amounts, expressing one quantity as a percentage of another, calculating percentage change, and working with reverse percentages. This lesson covers all of these skills.
| Term | Meaning |
|---|---|
| Percentage | A number expressed as a fraction of 100 (per cent = per hundred) |
| Multiplier | The decimal used to calculate a percentage (e.g. 0.35 for 35%) |
| Percentage increase | The amount has gone up by a given percentage |
| Percentage decrease | The amount has gone down by a given percentage |
| Reverse percentage | Working backwards from the final amount to find the original |
| Percentage change | The change expressed as a percentage of the original |
Use known percentages and build up from them.
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