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Lintel · Grades 5–7 Keystones #1 17 April 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 17 April 2025 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    490000

    Answer: 4.9 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + x - 2

    Answer: (x + 2)(x - 1)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 30cm, angle = 25°. Find adjacent side

    Answer: 27.2cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 10:8:10

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

    Calculate the mean of: 13, 30, 14, 5, 37, 47

    Answer: 24.3

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