GCSE Maths Revision - Percentages

24th April 2014

'Percent' means out of a hundred. If 60% of the population are brunette, this means 60 out of 100 people are brunette. 

A percentage is a fraction of 100. 

30% (30 in each 100) as a fraction is 30/100

30% as a decimal is 0.3.

If you need to find the percentage of a quantity, you must write the percentage as a fraction or decimal, then multiply by the quantity.

You might use this equation in real life, for example in a sale where you need to work out by how much an item is reduced. 

If an item is 40% off, and is £50 we would work it out like this; 

We firstly write 40% as a fraction: 40% = 40/100 = 4/10 = 2/5

Then we multiply by the quantity 2/5 × 50 = £20. There is £20 off the item. 


 Learn it through lyrics with a free 24 hour trial http://learnthrumusic.co.uk/subjects/#subject-2




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