Its simple!

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# Its simple! - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Its simple!' - quilla

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Presentation Transcript
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.
Which bag of Easter eggs is the better value?

\$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.

• 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
• 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
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.
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?
Exactly how many cans do I need?
• 1 L is the same as 1000 mL.
• I will need cans to make 1 litre.

1L = 1000 ml

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.

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.

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.

The large 820g box of Sultana Bran costs \$7.41.

1000 ÷ 820 =

boxes of 820g sultana Bran make 1 kg.

× \$7.41 = \$9.04

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!
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?