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Cornerstone · Grades 3–5 Keystones #1 15 December 2010 Skills week 1 of 7
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Five GCSE retrieval questions · 15 December 2010 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 3⁄6 + 2⁄6

    Answer: 5⁄6
  2. 2. Algebra Two-step equations

    Solve: 3x + 8 = 23

    Answer: x = 5
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 12cm and 16cm

    Answer: 20cm
  4. 4. Ratio Sharing in a ratio

    Divide 150 in the ratio 2:1:2

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

    Calculate the mean of: 45, 6, 44, 22, 6, 5, 23. Give your answer to 2 decimal places

    Answer: 21.57

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