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Lintel · Grades 5–7 Keystones #1 16 August 2025 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 16 August 2025 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    560000

    Answer: 5.6 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 2x - 15

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

    Hypotenuse = 17cm, angle = 65°. Find adjacent side

    Answer: 7.2cm
  4. 4. Ratio Mixed ratio problems

    In ratio 1:3:3, what fraction is the second part?

    Answer: 3⁄7
  5. 5. Statistics Mean

    The mean of 6 numbers is 35. If 5 of them are 33, 37, 31, 31, 18, what is the missing number?

    Answer: 60

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