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Lintel · Grades 5–7 Keystones #1 21 August 2020 Skills week 1 of 7
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Five GCSE retrieval questions · 21 August 2020 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    6900000

    Answer: 6.9 × 106
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 5x - 14

    Answer: (x + 7)(x - 2)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 26cm, angle = 57°. Find opposite

    Answer: 40cm
  4. 4. Ratio Mixed ratio problems

    Express the first part of 4:6 as a fraction in simplest form

    Answer: 2⁄5
  5. 5. Statistics Mean

    Calculate the mean of: 34, 41, 29, 38, 46, 7, 44, 24

    Answer: 32.9

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