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Cornerstone · Grades 3–5 Keystones #1 30 September 2010 Skills week 1 of 7
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Five GCSE retrieval questions · 30 September 2010 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 6⁄9 + 1⁄9

    Answer: 7⁄9
  2. 2. Algebra Two-step equations

    Solve: 7x + 9 = 58

    Answer: x = 7
  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 126 in the ratio 3:1:3

    Answer: 54, 18 and 54
  5. 5. Statistics Mean

    Calculate the mean of: 46, 12, 40, 22, 26, 31

    Answer: 29.5

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