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Lintel · Grades 5–7 Keystones #1 15 September 2025 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 15 September 2025 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    0.092

    Answer: 9.2 × 10-2
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 8x + 15

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

    Adjacent = 24cm, angle = 42°. Find opposite

    Answer: 21.6cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 8:20:16

    Answer: 2:5:4
  5. 5. Statistics Mean

    The mean of 4 numbers is 37. If 3 of them are 37, 16, 21, what is the missing number?

    Answer: 74