Author note — to cover (Higher)

Higher only, under G25's braced geometric arguments: two vectors are parallel exactly when one is a scalar multiple of the other; factorise expressions like 2a plus 4b to exhibit the multiple, and state the parallel conclusion in words. Collinearity builds on this on the next page. (G25)

• Fluency — direct questions on parallel vectors, 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).