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Cornerstone · Grades 3–5 Keystones #1 9 September 2010 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 9 September 2010 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 4⁄7 + 2⁄5

    Answer: 34⁄35
  2. 2. Algebra Two-step equations

    Solve: 3x + 9 = 21

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

    Calculate the hypotenuse when a = 8cm and b = 9cm. Give your answer to 2 decimal places

    Answer: 12.04cm
  4. 4. Ratio Sharing in a ratio

    Divide 105 in the ratio 3:3:1

    Answer: 45, 45 and 15
  5. 5. Statistics Mean

    Find the mean of: 20, 4, 14, 13, 19

    Answer: 14

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