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Cornerstone · Grades 3–5 Keystones #1 14 January 2013 Skills week 1 of 7
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Five GCSE retrieval questions · 14 January 2013 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄8 + 3⁄6

    Answer: 7⁄8
  2. 2. Algebra Two-step equations

    Solve: 2x - 15 = 15

    Answer: x = 15
  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 66 in the ratio 1:3:2

    Answer: 11, 33 and 22
  5. 5. Statistics Mean

    Calculate the mean of: 40, 17, 25, 5, 17, 34, 11. Give your answer to 2 decimal places

    Answer: 21.29

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