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Cornerstone · Grades 3–5 Keystones #1 28 January 2011 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 28 January 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 1⁄6 + 3⁄6

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

    Solve: 7x + 7 = 77

    Answer: x = 10
  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 240 in the ratio 4:1:3

    Answer: 120, 30 and 90
  5. 5. Statistics Mean

    Calculate the mean of: 27, 40, 5, 33, 43, 21, 42, 27

    Answer: 29.75

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