Author note — to cover

Cover the meaning of inverse proportion, one quantity multiplies and the other divides by the same factor so the product is constant, with 'is inversely proportional to' language and the equivalence to proportionality to 1/x stated informally. Worked contexts are the sibling problems page; constructing y = k/x is Higher's inverse-proportion-equations. Both tiers. (R10, R13)

• Fluency — direct questions on inverse proportion, 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).