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Cornerstone · Grades 3–5 Keystones #1 21 November 2010 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 21 November 2010 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄5 + 1⁄4

    Answer: 13⁄20
  2. 2. Algebra Two-step equations

    Solve: 4x - 15 = 17

    Answer: x = 8
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 9cm and 40cm

    Answer: 41cm
  4. 4. Ratio Sharing in a ratio

    Share 84 in the ratio 1:2

    Answer: 28 and 56
  5. 5. Statistics Mean

    Calculate the mean of: 16, 5, 36, 38, 19, 22, 42. Give your answer to 2 decimal places

    Answer: 25.43

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