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

  1. 1. Number Adding fractions

    Add: 1⁄4 + 7⁄8

    Answer: 9⁄8
  2. 2. Algebra Two-step equations

    Solve: 5x - 19 = 6

    Answer: x = 5
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 12cm and 16cm

    Answer: 20cm
  4. 4. Ratio Sharing in a ratio

    Divide 108 in the ratio 1:1:2

    Answer: 27, 27 and 54
  5. 5. Statistics Mean

    Calculate the mean of: 49, 48, 50, 16, 44, 37. Give your answer to 2 decimal places

    Answer: 40.67

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