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Cornerstone · Grades 3–5 Keystones #1 31 July 2013 Skills week 1 of 7
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Five GCSE retrieval questions · 31 July 2013 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄3 + 3⁄8

    Answer: 25⁄24
  2. 2. Algebra Two-step equations

    Solve: 3x + 9 = 21

    Answer: x = 4
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 9cm and 12cm

    Answer: 15cm
  4. 4. Ratio Sharing in a ratio

    Divide 120 in the ratio 2:1:1

    Answer: 60, 30 and 30
  5. 5. Statistics Mean

    Calculate the mean of: 6, 20, 46, 21, 42, 6, 31. Give your answer to 2 decimal places

    Answer: 24.57

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