AQA GCSE Mathematics · 8300
Specification R9 · Paper 1, Paper 2, Paper 3
- Revise: Percentages
The value before a percentage change was applied.
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GCSE Mathematics · key term
The value before the stated change took place; it represents 100% in a percentage-change problem.
Used by AQA, Edexcel and OCR
Specification R9 · Paper 1, Paper 2, Paper 3
The value before a percentage change was applied.
Specification R9 · Paper 1, Paper 2, Paper 3
Revise: Percentage Change and Original Value ProblemsThe starting amount is called the original value.
Before calculating, identify whether the question asks for a percentage, a change, a new value, an original value, interest, or a final balance.
For percentage change, divide by the original value, not the new value.
In a percentage-change calculation, divide by the original value, not the new value or the size of the change.
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Specification 2.03c · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
The quantity before any increase or decrease takes place.
Revise: Percentage Change and InterestA percentage change describes how much of the original value is added or removed. Suppose an amount increases by 10%. The original amount is 100% of itself, and another 10% is added, so the new amount is 110% of the original.