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Cornerstone · Grades 3–5 Keystones #1 23 September 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 23 September 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄7 + 2⁄5

    Answer: 19⁄35
  2. 2. Algebra Two-step equations

    Solve: 6x - 6 = 78

    Answer: x = 14
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 11cm and b = 7cm. Give your answer to 2 decimal places

    Answer: 13.04cm
  4. 4. Ratio Sharing in a ratio

    Share 45 in the ratio 2:3

    Answer: 18 and 27
  5. 5. Statistics Mean

    Calculate the mean of: 18, 6, 12, 27, 16, 38, 15. Give your answer to 2 decimal places

    Answer: 18.86

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