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Lintel · Grades 5–7 Keystones #247 4 September 2026 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 4 September 2026 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    4600000

    Answer: 4.6 × 106
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 12x + 35

    Answer: (x - 7)(x - 5)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 10cm, angle = 45°. Find opposite

    Answer: 10cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 9:6:15

    Answer: 3:2:5
  5. 5. Statistics Mean

    The mean of 4 numbers is 39. If 3 of them are 16, 36, 37, what is the missing number?

    Answer: 67