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Cornerstone · Grades 3–5 Keystones #1 22 January 2011 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 22 January 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 1⁄6 + 4⁄6

    Answer: 5⁄6
  2. 2. Algebra Two-step equations

    Solve: 7x - 14 = 70

    Answer: x = 12
  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 75 in the ratio 4:1

    Answer: 60 and 15
  5. 5. Statistics Mean

    Calculate the mean of: 5, 43, 47, 31, 22, 13. Give your answer to 2 decimal places

    Answer: 26.83

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