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Cornerstone · Grades 3–5 Keystones #1 6 October 2010 Skills week 1 of 7
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Five GCSE retrieval questions · 6 October 2010 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 2⁄5 + 2⁄5

    Answer: 4⁄5
  2. 2. Algebra Two-step equations

    Solve: 2x + 5 = 19

    Answer: x = 7
  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 57 in the ratio 1:2

    Answer: 19 and 38
  5. 5. Statistics Mean

    Calculate the mean of: 6, 46, 16, 18, 29, 37. Give your answer to 2 decimal places

    Answer: 25.33

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