Comparing prices properly · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Which pack is really cheaper

Life Skills · Money & Finance · ages 12-13
Name ______________________   Date ____________

  1. 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

  2. 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

  3. 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

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

    Answer: ______________

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

    Answer: ______________

  6. 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.

    Circle one:   True   False

  7. 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

  8. 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

  9. 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

  10. 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
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Answer key

For grown-ups. Fold this page away before handing over the rest.

Which pack is really cheaper W1-mt_v3i0WMP-Sl-s1

  1. The weight of rice in each pack · Price per gram needs the price and the number of grams. Prices alone do not tell you which pack costs less per gram.
  2. The 1 kg bag · One kilogram is 1,000 g. The bags cost $1.25 and $1.10 per 100 g, so the 1 kg bag is cheaper per gram too.
  3. The price for a stated amount, such as one litre · A unit price gives the cost for a stated amount, such as one item, one litre or 100 g.
  4. 0.7 · Five 100 g portions make 500 g. Divide $3.50 by 5 to get $0.70 per 100 g.
  5. 18 · Divide the $36 price by the target $2 per use: 18 uses. Checking, $36 divided by 18 is $2.
  6. False · Three small bottles give 3 litres for $6.00. That costs less than $6.50 for the same amount.
  7. The 24 oz box · The boxes cost $0.20 and $0.25 per ounce. The 24 oz box has the lower unit price.
  8. The $30 bag is lower at $3 per use, against $4 · Use actual counts: $48 divided by 12 is $4 per use. The other bag costs $30 divided by 10, or $3 per use.
  9. The gallon jug · Four quarts cost $5.60. The gallon costs $4.80 for the same amount, so the gallon is cheaper per quart.
  10. 4 bottles for $6.80 · The packs cost $1.80, $1.70 and $1.80 per bottle. The four-pack has the lowest unit price.
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