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Cornerstone · Grades 3–5 Keystones #1 13 February 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 13 February 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄4 + 1⁄7

    Answer: 9⁄14
  2. 2. Algebra Two-step equations

    Solve: 3x - 8 = 25

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

    Find the hypotenuse of a right triangle with sides 9cm and 12cm

    Answer: 15cm
  4. 4. Ratio Sharing in a ratio

    Share 25 in the ratio 1:4

    Answer: 5 and 20
  5. 5. Statistics Mean

    Calculate the mean of: 40, 17, 33, 19, 43, 36, 19, 28. Give your answer to 2 decimal places

    Answer: 29.38

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