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Cornerstone · Grades 3–5 Keystones #1 7 September 2020 Skills week 1 of 7
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Five GCSE retrieval questions · 7 September 2020 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 8⁄11 + 2⁄11

    Answer: 10⁄11
  2. 2. Algebra Two-step equations

    Solve: 5x + 15 = 30

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

    Find the hypotenuse of a right triangle with sides 9cm and 40cm

    Answer: 41cm
  4. 4. Ratio Sharing in a ratio

    Share 18 in the ratio 1:2

    Answer: 6 and 12
  5. 5. Statistics Mean

    Calculate the mean of: 43, 6, 10, 30, 35, 38, 32, 31

    Answer: 28.1

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