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Ratios and proportion
3:2
3:2 3 parts  water
3:2 2 parts  orange juice 3 parts  water
3:2 2 parts  orange juice 3 parts  water 3 + 2 = 5  equal parts…
Find value of one share if you know the value of the whole amount…
£350 £??
£350 £?? How did  you  work it out?
£350 £70 350 ÷ 5 = 70
£350 £70 £70 £70
£350 £70 £70 £70 3    70 = 210
£350 £210
£350 £210 £??
Find value of one share if you know the value of the other share…
£20
£20 ??
£20 £30
£20 £30 How did  you  work it out?
Try these problems, some in pictures and some in words…
Jim’s Jemima’s Write down the ratio using the  colon notation…
£800 Jim’s Jemima’s Find the value of Jim  and Jemima’s shares…
£?? £280 Find the value of the whole amount and the missing share… £??
Write down the ratio using the smallest  whole numbers you can…
How much cous-cous and water do you need for two servings?
Write the ratio of (dry) cous-cous to water in its lowest terms
Algernon wants to make 800g of  cooked  cous-cous. How much  dry  cous-cous does he need? And how much water in ml?

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Ratios And Proportion