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Post-16 maths: Ratio clip 2

Ratio is how you talk about the amount of one thing compared to another. If you have to mix one part of squash with four parts of water 鈥� that鈥檚 a ratio of 1:4. The ratio will tell you the total amount too 鈥� if mix 4 parts of water with one part of quash 鈥� you鈥檒l have 5 parts in total. You usually talk about ratios in the smallest number, so instead of saying 6:3 you鈥檇 say 2:1. You can also use ratios to scale recipes up and down. If 300g of pasta will feed 4 people, we have a ratio of pasta to people of 300 : 4. But you鈥檝e got 12 people for dinner 鈥� three times more people coming than the recipe states. If you multiply the number of people by three 鈥� you need to multiply the amount of pasta by three too 鈥� so 900g.

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