Author note — to cover

Add and subtract column vectors component-wise and diagrammatically nose to tail, the resultant of a two-leg journey, subtraction as adding the reverse vector, parallelogram picture included. G25 keeps both diagrammatic and column forms at both tiers. Routes expressed in a and b come later in this topic. (G25)

• Fluency — direct questions on adding and subtracting 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).