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Cornerstone · Grades 3–5 Keystones #1 2 October 2012 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 2 October 2012 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄7 + 2⁄3

    Answer: 23⁄21
  2. 2. Algebra Two-step equations

    Solve: 5x + 13 = 58

    Answer: x = 9
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 20cm and 21cm

    Answer: 29cm
  4. 4. Ratio Sharing in a ratio

    Share 50 in the ratio 2:3

    Answer: 20 and 30
  5. 5. Statistics Mean

    Calculate the mean of: 31, 11, 30, 12, 30, 39

    Answer: 25.5

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