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Proportion

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GCSE Maths (Year 8 Number 1) Mind Map on Proportion, created by Ellen Billingham on 06/05/2013.
Ellen Billingham
Mind Map by Ellen Billingham, updated more than 1 year ago
Ellen Billingham
Created by Ellen Billingham over 11 years ago
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Resource summary

Proportion
  1. Direct
    1. If I bought 20 apples for £1, how much would 12 apples cost?
      1. Find how much 1 apple would cost
        1. 100/20
          1. 5p
            1. Multiply by the number you want to find out
              1. 5 x 12 = 60
                1. 12 apples cost 60p
      2. AKA the unitary method
      3. Inverse
        1. If it takes 5 men 9 days to build a wall, how long does it take 6 men?
          1. Find how long it would have taken one man
            1. 5 x 9 = 45 days
              1. Divide it by the number of men you want to find out
                1. 45/6 = 7.5
                  1. It takes 6 men 7.5 days
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