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Cornerstone · Grades 3–5 Keystones #1 17 October 2013 Skills week 1 of 7
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Five GCSE retrieval questions · 17 October 2013 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 7⁄8 + 6⁄7

    Answer: 97⁄56
  2. 2. Algebra Two-step equations

    Solve: 6x + 9 = 81

    Answer: x = 12
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 15cm and 20cm

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

    Share 15 in the ratio 2:1

    Answer: 10 and 5
  5. 5. Statistics Mean

    Calculate the mean of: 28, 42, 50, 44, 26, 33, 38. Give your answer to 2 decimal places

    Answer: 37.29

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