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Lintel · Grades 5–7 Keystones #1 10 April 2017 Skills week 1 of 7
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Five GCSE retrieval questions · 10 April 2017 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 740,000 in standard form

    Answer: 7.4 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 2x - 80

    Answer: (x + 10)(x - 8)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 17cm, angle = 45°. Find opposite

    Answer: 17cm
  4. 4. Ratio Mixed ratio problems

    Orange, purple and pink beads are in the ratio 6:9:3. What fraction of the beads are purple?

    Answer: 1⁄2
  5. 5. Statistics Mean

    Calculate the mean of: 24, 13, 9, 41, 21, 42

    Answer: 25

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