1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Sig Fig

  1. Sep 5, 2006 #1
    If I had ((9-8.8))/8.8 how many sig figs would my answer have
  2. jcsd
  3. Sep 5, 2006 #2
    Only one sig fig. Since 9-8.8 = 0. and 0./8.8 = 0.

    On a side note: sig figs are really funny. You use 'em in high school but you never really use 'em afterwards (OK, maybe in chemistry but that's it).
    Last edited: Sep 5, 2006
  4. Sep 5, 2006 #3
    Sig figs were my least favorite part of physics.
  5. Sep 6, 2006 #4


    User Avatar
    Staff Emeritus
    Science Advisor

    Is the "9" a measured quantity or counted? If measured, then the fact that you only give one figure means it has only one significant figure- it could be anywhere between 8.5 and 9.5. If counted, then it is exact and can have any number of significant figures.

    In the first case, as swapnil said, it is (9- 9)/8.8= 0

    In the second, (9.0- 8.8)/8.8= 0.2/8.8= 0.023 (or, better, 2.3 x 10-2. The result has 2 significant figures because the "measured quanities", the "8.8"s have 2 significant figures.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Sig Fig
  1. Sig Fig (Replies: 5)

  2. Issue with sig figs (Replies: 1)