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

  1. 1. Number Adding fractions

    Calculate: 7⁄9 + 1⁄9

    Answer: 8⁄9
  2. 2. Algebra Two-step equations

    Solve: 2x - 10 = 12

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

    Find the hypotenuse of a right triangle with sides 15cm and 36cm

    Answer: 39cm
  4. 4. Ratio Sharing in a ratio

    Divide 220 in the ratio 4:3:3

    Answer: 88, 66 and 66
  5. 5. Statistics Mean

    Calculate the mean of: 34, 41, 7, 31, 13, 15, 5. Give your answer to 2 decimal places

    Answer: 20.86

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