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Cornerstone · Grades 3–5 Keystones #1 24 January 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 24 January 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄7 + 2⁄3

    Answer: 23⁄21
  2. 2. Algebra Two-step equations

    Solve: 7x + 13 = 90

    Answer: x = 11
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 7cm and b = 15cm. Give your answer to 2 decimal places

    Answer: 16.55cm
  4. 4. Ratio Sharing in a ratio

    Divide 156 in the ratio 2:1:3

    Answer: 52, 26 and 78
  5. 5. Statistics Mean

    Calculate the mean of: 37, 17, 13, 17, 36, 45, 38, 33

    Answer: 29.5

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