Communicating
Number - Which Deal Makes Sense?
Shop Offers
Shop 1: Buy 2 Get 1 Free
Shop 2: Up to 35% discount
Shop 3: 33â…“% off on all purchases
Your Task
work in a small group
Step 1- Understand the offers: As a group, discuss:
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What does each offer mean mathematically?
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What is guaranteed?
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What is not guaranteed?
Step 2 - Decide and justify: For the basket of 3 items at €12 each:
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Which shop gives the best deal?
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Are any deals the same?
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Which offer is least clear?
You must justify your decisions using numbers or calculations, words, a diagram or table (if helpful). A correct answer without explanation is not enough.
Step 3 - Challenge the advertising
Choose one statement below and explain whether it is always true, sometimes true, or never true:
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“Buy 2 Get 1 Free is the same as 33â…“% off.”
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“Up to 35% off means you will save 35%.”
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“Percent discounts are always clearer than offers like Buy 2 Get 1 Free.”
Explain your reasoning clearly. Show how you know your answer would still make sense if the price changed.”
Step 4 - Be ready to defend your thinking
Be ready to explain why your reasoning works and how you would convince someone who disagrees.
