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Capstone · Grades 7–9 Keystones #1 17 May 2011 Skills week 1 of 7
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Keystones — Capstone

Five GCSE retrieval questions · 17 May 2011 · mathsvault.uk/keystones

  1. 1. Number Simplifying surds

    Simplify: √833

    Answer: 7√17
  2. 2. Algebra Completing the square

    Complete the square: x² + 3x - 5

    Answer: (x + 3⁄2)² - 29⁄4
  3. 3. Geometry Area using ½ab sin C

    Find area of triangle: a = 16cm, b = 15cm, angle = 61°. Give your answer to 2 decimal places

    Answer: 104.95cm²
  4. 4. Ratio Combining two ratios

    a:b is 7:9 and b:c is 7:9. Find a:b:c in its simplest form.

    Answer: 49:63:81
  5. 5. Statistics Averages and range

    Find the mean, median and range of: 69, 74, 43, 88, 39, 31, 93, 97

    Answer: Mean = 66.75, Median = 71.5, Range = 66

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