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GCSE Mathematics · key term
An equality between two ratios, such as .
Used by AQA, Edexcel and OCR
Specification R7, S5 · Paper 1, Paper 2, Paper 3
Revise: Proportion as Ratio EqualityThis equality of ratios is called a proportion.
The fraction or percentage of a group that has a specified characteristic.
Keep quantities in the same order on both sides of a proportion, such as flour : portions = flour : portions.
For an estimated number, calculate the sample proportion and multiply it by the population size.
Keep the quantities in the same order on both sides of a proportion. For example, use flour over sugar in both fractions.
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Specification R7, R9 · Paper 1, Paper 2, Paper 3
Revise: ProportionTwo situations are in proportion when the comparison is unchanged: their ratios are equal.
A comparison found by dividing one quantity by another; it can be written as a fraction, decimal or percentage.
Specification 5.01d · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
A relationship in which two ratios are equal, so corresponding quantities change by the same scale factor.
Revise: Ratio ProblemsA proportion is present when this relationship stays unchanged as the amounts are enlarged or reduced.