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

Five GCSE retrieval questions · 7 March 2012 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 3⁄5 + 1⁄5

    Answer: 4⁄5
  2. 2. Algebra Two-step equations

    Solve: 7x - 7 = 91

    Answer: x = 14
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 8cm and 15cm

    Answer: 17cm
  4. 4. Ratio Sharing in a ratio

    Share 84 in the ratio 1:2

    Answer: 28 and 56
  5. 5. Statistics Mean

    Calculate the mean of: 34, 20, 30, 25, 34, 50, 47. Give your answer to 2 decimal places

    Answer: 34.29

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