Author note — to cover

Cover the definition that pairs of quantities are proportional when their ratios are equal: test tables by comparing ratios or unit values, and find a missing value by equating two ratios, cross-multiplication kept informal. Applications go to the unitary-method and sibling pages; the y = kx formalisation waits for later pages. Both tiers. (R7)

• Fluency — direct questions on proportion as equality of ratios, 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).