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

  1. 1. Number Adding fractions

    Add: 1⁄5 + 4⁄6

    Answer: 13⁄15
  2. 2. Algebra Two-step equations

    Solve: 6x + 13 = 61

    Answer: x = 8
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 9cm and b = 5cm. Give your answer to 2 decimal places

    Answer: 10.3cm
  4. 4. Ratio Sharing in a ratio

    Share 54 in the ratio 2:1

    Answer: 36 and 18
  5. 5. Statistics Mean

    Calculate the mean of: 10, 9, 20, 13, 18, 30, 38. Give your answer to 2 decimal places

    Answer: 19.71

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