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MATT’S MATHS

Ratios, fractions and percentages

Matt Jarvis helps demystify the mathematical requirements for psychology A-level. In this issue, Matt discusses ratios, fractions and percentages

Ratios, fractions and percentages can be defined as ways to represent proportions. ‘So, what are proportions?’ I hear you ask. Well, a proportion is a comparison between two numbers, specifically the relationship between a part of the whole and the whole itself. If your mind works anything like mine, then technical definitions like that just make it hurt rather than clarifying anything, so let’s look at a concrete example.

Say there are 20 students in your psychology class and 12 like Korean horror (sorry, Now We’re All Dead has been released as I write so Korean horror is on my mind). The proportion of K-Horror fans is 12 out of 20. So far, so good. But what does this have to do with ratios, fractions and percentages?

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