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

  1. 1. Number Converting to standard form

    390000

    Answer: 3.9 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 11x + 30

    Answer: (x - 5)(x - 6)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 21cm, angle = 35°. Find opposite

    Answer: 14.7cm
  4. 4. Ratio Mixed ratio problems

    Express the first part of 3:6 as a fraction in simplest form

    Answer: 1⁄3
  5. 5. Statistics Mean

    Calculate the mean of: 45, 50, 27, 31, 31, 23, 17

    Answer: 32

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