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

Five GCSE retrieval questions · 3 March 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 7⁄9 + 1⁄9

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

    Solve: 3x - 16 = 20

    Answer: x = 12
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 7cm and 24cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Share 30 in the ratio 2:1

    Answer: 20 and 10
  5. 5. Statistics Mean

    Calculate the mean of: 44, 15, 27, 38, 15, 33. Give your answer to 2 decimal places

    Answer: 28.67

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