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Cornerstone · Grades 3–5 Keystones #1 25 October 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 25 October 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄5 + 5⁄8

    Answer: 41⁄40
  2. 2. Algebra Two-step equations

    Solve: 5x + 5 = 25

    Answer: x = 4
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 5cm and b = 15cm. Give your answer to 2 decimal places

    Answer: 15.81cm
  4. 4. Ratio Sharing in a ratio

    Share 56 in the ratio 3:1

    Answer: 42 and 14
  5. 5. Statistics Mean

    Find the mean of: 5, 11, 10, 20, 19

    Answer: 13

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