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Cornerstone · Grades 3–5 Keystones #1 16 February 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 16 February 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄7 + 1⁄3

    Answer: 10⁄21
  2. 2. Algebra Two-step equations

    Solve: 4x + 12 = 52

    Answer: x = 10
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 20cm and 21cm

    Answer: 29cm
  4. 4. Ratio Sharing in a ratio

    Divide 100 in the ratio 2:1:2

    Answer: 40, 20 and 40
  5. 5. Statistics Mean

    Calculate the mean of: 36, 22, 40, 37, 50, 7, 13. Give your answer to 2 decimal places

    Answer: 29.29

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