Author note — to cover

Use a given or found nth term: generate stated terms, find the first term beyond a bound, and test membership by solving an + b = value and demanding a positive integer n, writing the conclusion as a sentence. Both tiers. The quadratic version is the Higher sibling. (A25)

• Fluency — direct questions on using an nth term, 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).