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Cornerstone · Grades 3–5 Keystones #1 8 September 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 8 September 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 4⁄6 + 2⁄5

    Answer: 16⁄15
  2. 2. Algebra Two-step equations

    Solve: 7x - 20 = 71

    Answer: x = 13
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 15cm and 36cm

    Answer: 39cm
  4. 4. Ratio Sharing in a ratio

    Divide 240 in the ratio 3:1:4

    Answer: 90, 30 and 120
  5. 5. Statistics Mean

    Calculate the mean of: 37, 39, 27, 21, 25, 7, 30. Give your answer to 2 decimal places

    Answer: 26.57

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