Author note — to cover (Higher)

Higher only, N7's braced clause. The index 1/n as the nth root, justified by raising a power to a power; evaluating 25 to the 1/2, 27 to the 1/3, 32 to the 1/5 without a calculator. General m/n indices follow next; Foundation stops at integer indices. (N7)

• Fluency — direct questions on unit fractional indices, 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).