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Truncating or Rounding Sig Figs - all your ships are belong to us! (Nov/22/2010 )

what is the rule on truncating or rounding numbers?

E.G. 43.192m say the final value has only 3 sigfigs; would the answer then be 43.1 or 43.2? to truncate or to round, that is the question. Whether tis' nobler in the...sorry :D


i would round to 43.2


3 sig figs usually means rounding to the nearest, as this would be more accurate than simply truncating


ok then, what if the number was 43.156 and the final answer had 3 sigfigs? My chemistry book says round to the nearest even number however the book was published in 2005 so I wanted to know if this is still common lab practice.