Author note — to cover

Evaluating multi-step calculations with brackets, indices, roots and the four operations; the fraction bar and root sign as implicit grouping; N3 names reciprocals within priority notation, so include them. Calculator keying lives on calculator-methods; algebraic substitution lives in Algebra. Both tiers. (N3)

• Fluency — direct questions on order of operations, 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).