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Lintel · Grades 5–7 Keystones #1 18 April 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 18 April 2025 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    83000

    Answer: 8.3 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 9x + 18

    Answer: (x - 3)(x - 6)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 31cm, angle = 46°. Find adjacent side

    Answer: 21.5cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 15:9:18

    Answer: 5:3:6
  5. 5. Statistics Mean

    Calculate the mean of: 23, 21, 50, 34, 21, 37, 36

    Answer: 31.7

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