Starter QuestionsStarter Questions1. Calculate the missing side of this right angled triangle.

3. The answer to the question is ½ x b x h What is the question?

2. A guitar costs £180. I can purchase this guitar by paying a deposit of 20% followed by 4 monthly payments of £41. How much extra will I be paying using this method?

10cm6cm

ProportionProportionDirect and Inverse

Example: It costs £60 for 2 hours worth of work in Jack’s garage. How much will it cost for 5 hours of work?

ProportionProportionDirect and Inverse

Example: These ingredients make 6 portions of chocolate cake.

300ml whipped cream60 g chocolate30g sugar

List the ingredients needed for 10 cakes

ProportionProportionDirect and Inverse

Example: 6 friends go on holiday at a cost of £130 each. One friend drops out leaving the others to

share the bill. How much will each friend need to pay now?

ProportionProportionDirect and Inverse

Which of these examples are Direct Proportion?

Which of these examples are Indirect Proportion?

‘when I double the number of cakes I double the cost’

‘when I double the amount of men I

half the time’1. The total cost and the number of items bought

2. The time taken and the speed travelled

3. The amount of wheat grown and the area its planted in

4. The number of cups of tea that can be poured from a teapot, and the size of the cup

Now try Ex 5.1 Ch 7 Pg 110

ProportionProportionInverse Proportion