Ratios and proportion.

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Ratios and Proportions

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Presentation transcript:

Ratios and proportion

3:2

3:2 3 parts water

2 parts orange juice 3:2 3 parts water

2 parts orange juice 3:2 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 Algernon wants to make 800g of cooked cous-cous. How much dry cous-cous does he need? And how much water in ml?