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Day 3 — The denominator changes the questionYear 12 Maths · T1 W1–2 · Day 3 lesson

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Year 12 / Mathematics / Term 1 / Weeks 01 02

Part of the full two-week lesson sequence. Check the pack guide and taught point before teaching.

Open for this lesson: Pack guide.

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Teacher copy: This page may include teaching prompts or answer keys. Answer keys in this public library can be viewed by anyone. Give learners a clean prompt, use checks as formative evidence, and change a case locally when prior access matters.

Success: Calculate row percentages for quiet-table choice in each session and state the comparison base.

  1. Notice · 3 min. Offer 12/20, 12/18 and 12/40. Which answers “of morning visits, what share chose quiet?”
  2. Model · 5 min. Compute 12 ÷ 20 × 100 = 60%. Read it as “60% of morning visits”, not “60% of everyone”.
  3. Try · 6 min. Learners calculate afternoon quiet and both group percentages. Allow a calculator while still writing numerators/denominators.
  4. Compare · 5 min. Each row must total 100%. Morning 60/40; afternoon 30/70. Ask why column percentages would answer a different question.
  5. Transfer · 4 min. Students say the quiet comparison in one precise sentence with counts and percentages, with written/AAC option.
  6. Exit · 2 min. Ask whether “18 of 40 quiet” answers the within-session question. Expected: no; it answers share of all visits.

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