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Cornerstone · Grades 3–5 Keystones #1 8 July 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 8 July 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 10⁄12 + 1⁄12

    Answer: 11⁄12
  2. 2. Algebra Two-step equations

    Solve: 2x + 7 = 23

    Answer: x = 8
  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 45 in the ratio 1:4

    Answer: 9 and 36
  5. 5. Statistics Mean

    Calculate the mean of: 30, 30, 5, 14, 45, 39, 9. Give your answer to 2 decimal places

    Answer: 24.57

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