Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

All of these numbers have 3 significant figures right?

  1. Sep 16, 2009 #1
    12.5
    100.00
    105
    2.5 x 10^3

    All of these numbers have 3 significant figures right?

     
  2. jcsd
  3. Sep 16, 2009 #2
    No, 12.5 and 105 have three significant figures. Look at the other two again
     
  4. Sep 16, 2009 #3

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    The last one is two sf, three would be 2.50 x10^3

    105 is 3sig fig
     
  5. Sep 16, 2009 #4
    I caught that shortly after, thank you.

    @pzona- Doesn't 100.00 only have two significant figures, the 1 and the two zeros after the decimal point?
     
  6. Sep 16, 2009 #5

    symbolipoint

    User Avatar
    Homework Helper
    Education Advisor
    Gold Member

    100.00 is written to indicate significance to the hundredths place. The number has five significant figures. (from locations of places Hundreds to Hundredths).
     
  7. Sep 17, 2009 #6
    The way I learned sig figs, there were 3 main rules.

    1. Zeros between nonzero digits are always significant (1001, 304)
    2. Zeros at the beginning of a number are never significant (0.001, 0.026)
    3. Zeros at the end of a number are significant if the number contains a decimal point (e.g. 100.00)

    These are pretty easy to remember, and I still find myself going through them in my head every time I need to count significant figures. Hopefully this helps.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: All of these numbers have 3 significant figures right?
  1. Significant figures (Replies: 6)

Loading...