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Cornerstone · Grades 3–5 Keystones #1 17 September 2010 Skills week 1 of 7
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Five GCSE retrieval questions · 17 September 2010 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄5 + 2⁄3

    Answer: 19⁄15
  2. 2. Algebra Two-step equations

    Solve: 3x + 12 = 42

    Answer: x = 10
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 5cm and 12cm

    Answer: 13cm
  4. 4. Ratio Sharing in a ratio

    Share 65 in the ratio 3:2

    Answer: 39 and 26
  5. 5. Statistics Mean

    Calculate the mean of: 7, 45, 37, 8, 13, 20, 33. Give your answer to 2 decimal places

    Answer: 23.29

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