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Cornerstone · Grades 3–5 Keystones #1 9 March 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 9 March 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 6⁄9 + 1⁄9

    Answer: 7⁄9
  2. 2. Algebra Two-step equations

    Solve: 5x + 8 = 23

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

    Find the hypotenuse of a right triangle with sides 9cm and 40cm

    Answer: 41cm
  4. 4. Ratio Sharing in a ratio

    Divide 225 in the ratio 2:4:3

    Answer: 50, 100 and 75
  5. 5. Statistics Mean

    Calculate the mean of: 33, 22, 31, 47, 42, 50, 21, 47. Give your answer to 2 decimal places

    Answer: 36.63

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