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Cornerstone · Grades 3–5 Keystones #1 30 June 2010 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 30 June 2010 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 5⁄7 + 1⁄8

    Answer: 47⁄56
  2. 2. Algebra Two-step equations

    Solve: 4x + 11 = 59

    Answer: x = 12
  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

    Divide 126 in the ratio 1:3:2

    Answer: 21, 63 and 42
  5. 5. Statistics Mean

    Calculate the mean of: 41, 28, 16, 21, 31, 42. Give your answer to 2 decimal places

    Answer: 29.83

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