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Day 16 · Build the whole two-way table · AC9M10ST04Year 10 Maths · T1 W3–4 · Day 16 lesson

Prepare this lesson

Year 10 / Mathematics / Term 1 / Weeks 03 04

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

Open for this lesson: Pack guide · Fresh learner checks · Aids and text routes.

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.

Learner prompts

Goal: distinguish two categorical variables, cells, margins and a missing label. 25 = 2 + 5 + 7 + 7 + 4.

0–2: Introduce Source C: 50 invented designs, not players. Theme and side count are categorical variables.
2–7: Locate Puzzle/two-sided 18, Puzzle row total 24 and two-sided column total 30. Explicitly add 18+9+3=30 and 24+18+8=50.
7–14: Learners reconstruct a blank category grid from Source C, including No theme assigned; check all margins by two directions.
14–21: Routes: sort labelled count tiles into tactile rows/columns; fill a large-print matrix; dictate a cell and margin audit to an exact-word scribe. Each route checks two cells and the grand total.
21–25: Exit “What does 30 count? What does 50 count?” Look-for: two-sided designs versus all designs. Next move: if a learner excludes no-theme cards, point to their known side counts.

Another setting: Imaginary plant-label designs by colour and fold type, not real plants. Optional/home: draw a 2×2 table from four invented cards.

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