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Lintel · Grades 5–7 Keystones #1 31 December 2025 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 31 December 2025 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    420000

    Answer: 4.2 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 5x - 24

    Answer: (x + 8)(x - 3)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 32cm, angle = 56°. Find adjacent side

    Answer: 17.9cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 16:20:12

    Answer: 4:5:3
  5. 5. Statistics Mean

    Calculate the mean of: 6, 14, 45, 46, 14, 28

    Answer: 25.5

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