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Lintel · Grades 5–7 Keystones #1 10 October 2025 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 10 October 2025 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    50000000

    Answer: 5 × 107
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 5x - 14

    Answer: (x + 7)(x - 2)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 22cm, angle = 44°. Find adjacent side

    Answer: 15.8cm
  4. 4. Ratio Mixed ratio problems

    Express the first part of 3:2 as a fraction in simplest form

    Answer: 3⁄5
  5. 5. Statistics Mean

    Calculate the mean of: 39, 34, 18, 41, 34, 17

    Answer: 30.5

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