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Cornerstone · Grades 3–5 Keystones #1 23 February 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 23 February 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄5 + 3⁄7

    Answer: 29⁄35
  2. 2. Algebra Two-step equations

    Solve: 4x + 12 = 36

    Answer: x = 6
  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 90 in the ratio 3:2:1

    Answer: 45, 30 and 15
  5. 5. Statistics Mean

    Find the mean of: 23, 16, 2, 15

    Answer: 14

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