Author note — to cover

Cover the sign flip when multiplying or dividing an inequality by a negative, e.g. solving 5 − 2x > 11, alongside the alternative of moving the unknown to keep its coefficient positive; stress the flip happens on every such step and never for adding or subtracting. Both tiers. (A22)

• Fluency — direct questions on when the inequality sign reverses, 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).