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Lintel · Grades 5–7 Keystones #200 19 July 2026 Skills week 1 of 7
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Five GCSE retrieval questions · 19 July 2026 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    950000

    Answer: 9.5 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 2x - 15

    Answer: (x + 5)(x - 3)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 21cm, angle = 35°. Find opposite

    Answer: 14.7cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 4:8:8

    Answer: 1:2:2
  5. 5. Statistics Mean

    Calculate the mean of: 16, 21, 8, 19, 48, 31

    Answer: 23.8

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