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Cornerstone · Grades 3–5 Keystones #1 20 September 2011 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 20 September 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 10⁄12 + 1⁄12

    Answer: 11⁄12
  2. 2. Algebra Two-step equations

    Solve: 4x - 15 = 17

    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

    Share 39 in the ratio 2:1

    Answer: 26 and 13
  5. 5. Statistics Mean

    Calculate the mean of: 27, 48, 28, 48, 20, 5. Give your answer to 2 decimal places

    Answer: 29.33

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