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Cornerstone · Grades 3–5 Keystones #1 8 November 2012 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 8 November 2012 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄5 + 5⁄8

    Answer: 33⁄40
  2. 2. Algebra Two-step equations

    Solve: 5x + 10 = 25

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

    Find the hypotenuse of a right triangle with sides 6cm and 8cm

    Answer: 10cm
  4. 4. Ratio Sharing in a ratio

    Share 100 in the ratio 4:1

    Answer: 80 and 20
  5. 5. Statistics Mean

    Calculate the mean of: 45, 40, 49, 8, 17, 9, 47. Give your answer to 2 decimal places

    Answer: 30.71

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