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Cornerstone · Grades 3–5 Keystones #1 17 February 2013 Skills week 1 of 7
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Five GCSE retrieval questions · 17 February 2013 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 6⁄12 + 4⁄12

    Answer: 5⁄6
  2. 2. Algebra Two-step equations

    Solve: 2x - 11 = 1

    Answer: x = 6
  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

    Share 42 in the ratio 4:3

    Answer: 24 and 18
  5. 5. Statistics Mean

    Calculate the mean of: 41, 6, 19, 39, 15, 31, 24, 6. Give your answer to 2 decimal places

    Answer: 22.63

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