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Cornerstone · Grades 3–5 Keystones #1 9 October 2011 Skills week 1 of 7
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Five GCSE retrieval questions · 9 October 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄4 + 7⁄8

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

    Solve: 4x + 8 = 20

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

    Find the hypotenuse of a right triangle with sides 20cm and 21cm

    Answer: 29cm
  4. 4. Ratio Sharing in a ratio

    Share 98 in the ratio 4:3

    Answer: 56 and 42
  5. 5. Statistics Mean

    Calculate the mean of: 50, 15, 39, 43, 7, 19, 8. Give your answer to 2 decimal places

    Answer: 25.86

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