Author note — to cover

Cover classifying percentage problems before solving: does the question state the original (multiply) or the changed amount (divide)? Mixed forward and reverse sets, increase and decrease, and language cues like 'after the rise' or 'was'. No new arithmetic; techniques come from the multiplier and reverse sibling pages. Both tiers. (R9)

• Fluency — direct questions on spotting a reverse problem, 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).