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Cornerstone · Grades 3–5 Keystones #1 6 March 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 6 March 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 2⁄10 + 3⁄10

    Answer: 1⁄2
  2. 2. Algebra Two-step equations

    Solve: 7x + 12 = 68

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

    Find the hypotenuse of a right triangle with sides 15cm and 20cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Divide 110 in the ratio 2:1:2

    Answer: 44, 22 and 44
  5. 5. Statistics Mean

    Calculate the mean of: 17, 12, 9, 19, 22, 16, 9. Give your answer to 2 decimal places

    Answer: 14.86

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