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Cornerstone · Grades 3–5 Keystones #1 2 September 2010 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 2 September 2010 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 4⁄11 + 4⁄11

    Answer: 8⁄11
  2. 2. Algebra Two-step equations

    Solve: 7x + 15 = 78

    Answer: x = 9
  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

    Share 21 in the ratio 2:1

    Answer: 14 and 7
  5. 5. Statistics Mean

    Calculate the mean of: 12, 47, 22, 50, 46, 31, 32. Give your answer to 2 decimal places

    Answer: 34.29

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