Best BuysCalculate the unit cost of items to help determine which of two similar products is the best buy. 
Calculate which of the two items is the best value then drag that item into the shopping trolley.
One Day Sale!
One Day Sale!
This is Best Buys level 5. You can also try:
Level 1
Level 2
Level 3
Level 4


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Level 1  Where the unit cost can be found by multiplying or dividing by a whole number
Level 2  Where the unit cost can be found by multiplying or dividing by a fraction
Level 3  Calculating the price difference per unit of given products
Level 4  A Best Buy draganddrop activity
Level 5  A harder Best Buy draganddrop activity
More on this topic including lesson Starters, visual aids, investigations and selfmarking exercises.
Imagine you were in a supermarket looking for washing powder when you see two similar boxes: brand A and Brand B.
The boxes are different sizes and different prices so you calculate the cost of 1 gram of each type of powder to find the best buy.
Brand A: 267 ÷ 1200 = 0.2225 pence per gram.
Brand B: 291 ÷ 1300 = 0.2238 pence per gram.
Brand A is the cheapest (per gram) so that is the best buy.
Note that people don't always buy the product that works out to be the cheapest. There may be other considerations such as the amount of the product they actually need. This exercise however is about using unit pricing to find the best value product.
Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.
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