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Cornerstone · Grades 3–5 Keystones #1 28 September 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 28 September 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 4⁄10 + 1⁄10

    Answer: 1⁄2
  2. 2. Algebra Two-step equations

    Solve: 6x - 17 = 13

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

    Find the hypotenuse of a right triangle with sides 15cm and 20cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Divide 105 in the ratio 1:1:3

    Answer: 21, 21 and 63
  5. 5. Statistics Mean

    Find the mean of: 4, 15, 13, 11, 17

    Answer: 12

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