Two sealed packs of the same rice cost $4 and $6. Neither pack's quantity is shown. What information is needed to compare their prices per gram?

• The weight of rice in each pack
• The colour printed on each pack's label
• The time when the shop closes that evening
• The order in which the packs reached the shelf

A 400 g bag of coffee costs $5.00. A 1 kg bag of the same coffee costs $11.00. Which bag is cheaper per gram?

• The 1 kg bag
• The 400 g bag
• They cost the same per gram

What does a unit price tell you?

• The total number of packs available on a shop shelf
• The whole pack's price after every extra charge
• The price for a stated amount, such as one litre

A 500 g box of pasta costs $3.50. What is the price per 100 g, in dollars?

A bag costs $36. How many uses are needed for its purchase cost to work out at exactly $2 per use?

The same juice costs $2.00 for a 1-litre bottle or $6.50 for a 3-litre bottle. Sam says the bigger bottle is cheaper per litre.

A 24 oz box of cereal costs $4.80 and a 10 oz box of the same cereal costs $2.50. Here oz measures weight. Which costs less per ounce?

• The 10 oz box
• The 24 oz box
• They cost the same per ounce

A $48 bag was expected to have 24 uses, but gets only 12. A $30 bag gets 10 uses. Which statement matches their actual cost per use?

• The $48 bag is lower at $2 per use, against $3
• The bags are equal at $3 per use after their actual uses
• The $30 bag is lower at $3 per use, against $4
• The $48 bag is lower because its purchase price is higher

A quart of milk costs $1.40 and a gallon of the same milk costs $4.80. Four quarts make a gallon. Which is cheaper per quart?

• The gallon jug
• Four quart bottles
• They cost the same per quart

All these packs contain the same size and brand of water bottle. Which pack costs least per bottle?

• 2 bottles for $3.60
• 4 bottles for $6.80
• 6 bottles for $10.80
• All three have the same price per bottle