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LESSON · MATHEMATICS · MATH.2.3.1

Linear equations in one unknown — solving by balancing

40 minTier 1: pictorial · Tier 2: numeric · Tier 3: word problems

MaterialsWhiteboard, balance scale model, exit-ticket strips

  1. 01Engage5 min

    Show the balance scale. 3 oranges on one side, write 'x' + 8 oranges on the other. Ask: what is x?

    concrete
  2. 02Explore8 min

    Pairs work with bean-balance sets. Find x for 4 prompts of increasing complexity. No procedure yet.

    pairmanipulative
  3. 03Explain10 min

    Formalise: whatever you do to one side, do to the other. Notation: 3 + x = 8 ↔ x = 5.

    modelling
  4. 04Elaborate12 min

    Apply to a matatu-fare prompt. Then a two-step: 2x + 3 = 11. Differentiated set in the library.

    transfer
  5. 05Evaluate5 min

    Exit ticket — 4 CFItem-mapped questions, auto-marked. Mistakes preload Saturday's CEA practice set.

    cea-linkauto-marked