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Cornerstone · Grades 3–5 Keystones #1 27 September 2010 Skills week 1 of 7
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Five GCSE retrieval questions · 27 September 2010 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄6 + 2⁄3

    Answer: 7⁄6
  2. 2. Algebra Two-step equations

    Solve: 3x - 15 = 21

    Answer: x = 12
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 6cm and 8cm

    Answer: 10cm
  4. 4. Ratio Sharing in a ratio

    Divide 170 in the ratio 3:3:4

    Answer: 51, 51 and 68
  5. 5. Statistics Mean

    Find the mean of: 7, 16, 5, 13, 9

    Answer: 10

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