Which is better value? a) 5 oranges for 80c


a) 5 oranges = 80c 1 orange = 80 ÷ 5 1 orange = 16c


or


b) 4 oranges for 68c


To find out which is better value, we need to find the price of 1 orange in both cases. This is called the unitary method, or finding 1 unit.


b) 4 oranges = 68c 1 orange = 68 ÷ 4 1 orange = 17c


5. Try using the unitary method in the following table to find whether A or B is better value.


A


5 apples for 90c 3 pens for €1.20 7 bars for €1.75


B


4 apples for 80c 8 pens for €2.80 10 bars for €2.20


6. Jack would like to buy some goldfish and has been given these prices. Which option is better value?


a) b) Better Value: A or B?


Calculating Shopping Bills


Bill’s Barbecue Bill is having a barbecue at the weekend and has a lot to organise. Help him with his shopping. (Hint: use the unitary method to find the value of 1 item and then multiply by the number of items Bill wants.)


For example: 5 loaves of bread cost €4.45. How much will 7 loaves cost? 5 = €4.45


1 = €4.45 ÷ 5 = €0.89 7 = €0.89 × 7 = €6.23


134 Money


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