GCSE›AQA GCSE Maths›Mind mapsRatio and ProportionAQA GCSE Maths: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsRatio notationCompares quantities, e.g. 3:23:23:2Reduce to simplest form using the HCF8:12=2:38:12 = \mathbf{2:3}8:12=2:3Can be written as a fractionA multiplicative link matches y=kxy = kxy=kxSharing in a ratioAdd the parts to get total sharesDivide the total by the sharesMultiply each part by one share£60 in 2:3:52:3:52:3:5 gives £12, £18, £30Part:part or wholePart:part compares parts, e.g. boys : girlsPart:whole compares a part to the totalIdentify which one is being usedRatioand proportion3:2÷HCFShapes and scaleRatios compare lengths, areas, volumesSimilar shapes have a scale factor kkkCorresponding lengths are in ratio 1:k1:k1:kUsed for scale diagrams and mapsReal contextsProportion means equal ratiosConversion of currencies and unitsMixing and concentrationsBest buy: compare price per unitExam tipsCompare the same unit in best-buy questionsCheck the ratio adds up to the totalSimplify ratios in the final answer