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Significant Figures addition & conversion

  1. Sep 27, 2011 #1
    Having a discussion with a colleague over sig figs and conversions.

    Original problem: find perimeter of 12.6 ft by 13.88 ft room and express answer in meters.

    16.1 m or 16.2 m?

    Question is when to round? After finding perimeter in feet? 53.0 feet to meters = 16.2 meters or at the end? 52.96 feet = 16.1 meters?
  2. jcsd
  3. Sep 27, 2011 #2
    I find it's usually best to round at the final answer.
  4. Sep 27, 2011 #3


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    (Emphatically) agree !
  5. Sep 27, 2011 #4
    Keep as many digits throughout your work as you can, then round at the end.
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