Day 11 · One annual amount, three period averagesYear 11 Maths · T1 W3–4 · Day 11 lesson

Goal: convert Card A's gross annual model amount to correctly labelled weekly, fortnightly and monthly averages. 25 = 2 + 5 + 6 + 7 + 5.

1. 0–2: Display $65,520 per year; ask why $65,520 ÷ 12 and ÷52 answer different questions. Read “gross” and “model” aloud.
2. 2–7: Model $65,520 ÷ 52 = $1,260 per model week; multiply by two for $2,520 per fortnight. Check $1,260×52=$65,520. Do not call this net take-home pay.
3. 7–13: Learners find monthly $65,520÷12=$5,460, verify 5,460×12, and contrast average month with unequal real calendar month lengths.
4. 13–20: Routes: move annual→52/26/12 period cards and write equations; complete the period table in large print; type or dictate three expressions with units and a reverse-multiplication check. All routes name gross-versus-net uncertainty.
5. 20–25: Exit “Which divisor gives a fortnightly model average?” Key: 26, yielding $2,520. Move: if a learner multiplies by 26, use 26 periods × amount/period = annual amount to restore direction.

Alternative domain: A fictional theatre production salary, not a real contract. Optional/home: convert an invented $52,000 annual model; no personal payslip.