Author note — to cover

Cover price per unit as a rate used both ways: multiply to cost a quantity, divide to find what a budget buys, and price-per-100g comparisons. Deliberate overlap with Proportion's best-buy-comparisons: that page owns choosing between packs and offers, this one the rate mechanics and rearrangement. Both tiers. (R11)

• Fluency — direct questions on unit pricing, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).