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Lintel · Grades 5–7 Keystones #1 8 December 2025 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 8 December 2025 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    0.00093

    Answer: 9.3 × 10-4
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 2x - 3

    Answer: (x + 3)(x - 1)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 14cm, angle = 60°. Find opposite

    Answer: 24.2cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 6:6:8

    Answer: 3:3:4
  5. 5. Statistics Mean

    The mean of 4 numbers is 23. If 3 of them are 47, 22, 36, what is the missing number?

    Answer: -13