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Cornerstone · Grades 3–5 Keystones #1 22 December 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 22 December 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄7 + 1⁄3

    Answer: 16⁄21
  2. 2. Algebra Two-step equations

    Solve: 6x - 20 = 28

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

    Find the hypotenuse of a right triangle with sides 7cm and 24cm

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

    Divide 65 in the ratio 1:1:3

    Answer: 13, 13 and 39
  5. 5. Statistics Mean

    Calculate the mean of: 44, 41, 49, 34, 47, 38, 37, 21. Give your answer to 2 decimal places

    Answer: 38.88

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