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Cornerstone · Grades 3–5 Keystones #1 27 December 2011 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 27 December 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄4 + 1⁄8

    Answer: 3⁄8
  2. 2. Algebra Two-step equations

    Solve: 2x + 11 = 19

    Answer: x = 4
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 5cm and 12cm

    Answer: 13cm
  4. 4. Ratio Sharing in a ratio

    Share 25 in the ratio 1:4

    Answer: 5 and 20
  5. 5. Statistics Mean

    Calculate the mean of: 5, 5, 31, 28, 19, 39, 40. Give your answer to 2 decimal places

    Answer: 23.86

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