Author note — to cover (Higher)

Higher only, N8's braced clause. Extracting the largest square factor to write root 12 as 2 root 3, reversing to compare surd sizes, and N8's own example root 12 = root 4 times root 3. Surd arithmetic lives on the sibling pages; Foundation never meets surds. (N8)

• Fluency — direct questions on simplifying surds, 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).