Author note — to cover

The square root as the inverse of squaring; roots of perfect squares to 225 and of decimals like root 0.25, non-calculator. The two-solution issue lives on positive-and-negative-roots; estimating irrational roots lives on Measures estimating-roots; surd manipulation is Higher, in the surds group. Both tiers. (N6, N7)

• Fluency — direct questions on square roots, 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).