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Homework Help: Sig figs physics problems

  1. Oct 15, 2007 #1
    I need an explanation for these two problems

    How many sig figs should be retained in the result of the following calculation?

    12.00000 x 0.9893 + 13.00335 x 0.0107


    (11.13-2.6) x 10^4 / (103.05 + 16.9) x 10 ^-6
  2. jcsd
  3. Oct 15, 2007 #2
    3 and 2.

    Significant fig's is just a rule of thumb, proper uncertainty analysis is more detailed.
    Last edited: Oct 15, 2007
  4. Oct 16, 2007 #3


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    Science Advisor

    Pick the number in multiplication or division with the least number of SF.
    In your first eq., it is 3.
    In your second, you first have to do 11.13-2.6=8.5, with 2 SF.
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