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What a best buy question is really asking

What a best buy question is really asking

In a best buy question, you are not looking for the lowest total price. You are looking for the option that gives the lowest cost for the same amount of product.

A useful method is:

  1. Read the price and amount for each option.
  2. Adjust any offers so you know the total cost and total amount.
  3. Choose a fair unit to compare, such as per item, per kg, per 100 g, or per 100 ml.
  4. Convert to pence if that makes the arithmetic easier.
  5. Calculate the unit price for each option.
  6. Compare the unit prices.
  7. Pick the option with the smaller unit price.

Best Buy Questions Lesson

  1. IGCSE
  2. /Maths
  3. /Best Buy Questions

Step-by-step lessons covering CIE IGCSE Maths Best Buy Questions for Core and Extended tier. Each lesson works through exam-style questions in Paper 1 and Paper 3 (Core) or Paper 2 and Paper 4 (Extended) format. Start with the Core-tier fundamentals in number and algebra before moving on to the more demanding Extended-only topics like calculus-adjacent algebra and advanced trigonometry.

Lessons