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Cornerstone · Grades 3–5 Keystones #1 13 October 2017 Skills week 1 of 7
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Five GCSE retrieval questions · 13 October 2017 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 5⁄6 + 6⁄7

    Answer: 71⁄42
  2. 2. Algebra Two-step equations

    Solve: 7x - 13 = 78

    Answer: x = 13
  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 35 in the ratio 4:1

    Answer: 28 and 7
  5. 5. Statistics Mean

    Calculate the mean of: 21, 5, 25, 23, 24, 45, 22, 46. Give your answer to 2 decimal places

    Answer: 26.38

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