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Cornerstone · Grades 3–5 Keystones #1 1 January 2015 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 1 January 2015 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 4⁄7 + 1⁄5

    Answer: 27⁄35
  2. 2. Algebra Two-step equations

    Solve: 6x + 5 = 77

    Answer: x = 12
  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 100 in the ratio 2:2:1

    Answer: 40, 40 and 20
  5. 5. Statistics Mean

    Calculate the mean of: 47, 27, 11, 9, 24, 25, 42, 34. Give your answer to 2 decimal places

    Answer: 27.38

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