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Cornerstone · Grades 3–5 Keystones #1 3 July 2013 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 3 July 2013 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 4⁄6 + 3⁄4

    Answer: 17⁄12
  2. 2. Algebra Two-step equations

    Solve: 5x + 15 = 50

    Answer: x = 7
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 15cm and 20cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Share 90 in the ratio 4:1

    Answer: 72 and 18
  5. 5. Statistics Mean

    Calculate the mean of: 12, 28, 40, 20, 48, 5, 17. Give your answer to 2 decimal places

    Answer: 24.29

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