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Its simple! All you have to do is: Convert each price to a price per kilogram. [Or price per litre if the item is a liquid.] Then choose the cheapest price. Note! There are several different ways to do the maths. This PowerPoint shows only one of the ways.

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Which bag of Easter eggs is the better value? The purple packet costs $9.98 for 475g or $22.59 per kg The red packet costs $3.48 for 180 g or $20.78 per kg $20.78 for 1 kg is less than $22.59 for 1 kg. The red 180g packet is better value for money. The smaller packet is the better value.

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A 500g bag of pasta costs $3.65. What is the price per kilogram? 500g + 500 g = 1000g Two bags of pasta contain 1000g or 1 kg. $3.65 + $3.65 = $7.30 Or 2 × $3.65 = $7.30 The price per kilogram is $7.30

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Which packet of rice is the better value? Two 500g packets make 1kg. $2.10 × 2 = $4.20 In the 500g packet the rice costs $4.20 per kg. In the 5 kg pack one kg of rice costs $22.60 ÷ 5 = $4.52 $4.20 is cheaper than $4.52. The 500 g packet is the better value.

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A 375 ml can of soft drink is priced at $1.40. Calculate the price per litre. Two cans of drink contain 2 × 375 ml = 750 ml. Three cans contain 3 × 375 ml = 1125 ml Two and a bit cans hold 1000 ml or 1 litre. Two cans is not enough and three cans is too many. Exactly how many cans do I need?

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1 L is the same as 1000 mL. I will need cans to make 1 litre. 1L = 1000 ml

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How much will 1 litre costs? Cost of 1 litre = cost for 1 can × number of cans Cost of 1 litre = $1.40 per can × cans = $3.73 1 litre will cost $3.73 375 mL for $1.40 is equivalent to $3.73 per litre.

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What size Sultana Bran is the best value?

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In the small packet the price of the Sultana Bran is $44.22 per kg. One small packet weighs 45g. 1000 ÷ 45 = packets weigh 1 kg One small packet costs $1.99. × $1.99 = $44.22 45g for $1.99 is equivalent to $44.22 per kilogram.

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In the 500g box, the price of the Sultana Bran is $11.58 per kilogram. One 500g packet of Sultana Bran costs $5.79. Two packets of 500g Sultana Bran make 1 kg. 2 × $5.79 = $11.58 500g for $5.79 is equivalent to $11.58 per kilogram.

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In the 820g box the price of the Sultana Bran is $9.04 per kilogram. The large 820g box of Sultana Bran costs $7.41. 1000 ÷ 820 = boxes of 820g sultana Bran make 1 kg. × $7.41 = $9.04

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45g for $1.99 = $44.22 per kg 500g for $5.79 = $11.58 per kg 820g for $7.41 = $9.04 per kg The 820g packet is the best value. The 45g packet is very poor value!

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Summary of how to do the maths Calculate the number of containers required to make 1 kilogram or 1 litre. (1000 ÷ size of the container in g or mL) Calculate the price of 1 kg or 1 L by multiplying the price per container by the number of containers required to make 1 kg or 1 L. Remember! There are other ways to do the maths. Can you do the calculations a different way?

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