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Lintel · Grades 5–7 Keystones #1 24 October 2021 Skills week 1 of 7
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Five GCSE retrieval questions · 24 October 2021 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    99000000

    Answer: 9.9 × 107
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 3x - 28

    Answer: (x + 7)(x - 4)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 31cm, angle = 36°. Find adjacent side

    Answer: 25.cm
  4. 4. Ratio Mixed ratio problems

    In ratio 4:3:1, what fraction is the second part?

    Answer: 3⁄8
  5. 5. Statistics Mean

    The mean of 5 numbers is 23. If 4 of them are 23, 42, 33, 35, what is the missing number?

    Answer: -18

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