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Cornerstone · Grades 3–5 Keystones #1 25 September 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 25 September 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 1⁄6 + 3⁄6

    Answer: 2⁄3
  2. 2. Algebra Two-step equations

    Solve: 2x + 12 = 20

    Answer: x = 4
  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 90 in the ratio 2:4:3

    Answer: 20, 40 and 30
  5. 5. Statistics Mean

    Calculate the mean of: 37, 38, 39, 30, 47, 41. Give your answer to 2 decimal places

    Answer: 38.67

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