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Cornerstone · Grades 3–5 Keystones #1 31 October 2010 Skills week 1 of 7
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Five GCSE retrieval questions · 31 October 2010 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 5⁄7 + 1⁄7

    Answer: 6⁄7
  2. 2. Algebra Two-step equations

    Solve: 4x - 15 = 25

    Answer: x = 10
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 9cm and 12cm

    Answer: 15cm
  4. 4. Ratio Sharing in a ratio

    Share 114 in the ratio 1:2

    Answer: 38 and 76
  5. 5. Statistics Mean

    Calculate the mean of: 38, 6, 33, 17, 15, 38

    Answer: 24.5

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