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Cornerstone · Grades 3–5 Keystones #1 27 December 2010 Skills week 1 of 7
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Five GCSE retrieval questions · 27 December 2010 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 5⁄7 + 1⁄7

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

    Solve: 6x + 9 = 39

    Answer: x = 5
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 7cm and 24cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Share 95 in the ratio 1:4

    Answer: 19 and 76
  5. 5. Statistics Mean

    Calculate the mean of: 15, 14, 9, 31, 13, 41

    Answer: 20.5

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