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Maths I

Ratio

Splitting a quantity in a given ratio

Follow this example of splitting a quantity in a given ratio

£30 is shared between Ken and John in the ratio 2 : 1. How much does each get?

If something is split in the ratio 2 : 1, then there are 3 'parts' altogether.

 

  • 1 'part' = {\pounds 30 \over 3} = \pounds 10

  • Ken has 2 parts = 2 x £10 = £20

  • John has 1 part = x £10 = £10

Use the same method of working to solve this question

Question

There are 180 pupils in a school year. The ratio of left handed pupils to right handed pupils is 1 : 8. How many pupils are right handed?

Answer

The ratio is 1 : 8 so there are 9 'parts' altogether

  • 1 'part' = {180 \over 9} = 20

  • Left-handed pupils = 1 part = 1 x 20 = 20

  • Right-handed pupils = 8 parts = 8 x 20 = 160

Watch

A stunt accident being set up for an episode of Casualty.

Class Clips

Video clip about the use of maths, including ratio, in setting up a crash stunt for Casualty

Play

A picture of Mia Cadaver

Tombstone Timeout

Swot up your sums with Mia Cadaver's maths game

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