1. Not finding help here? Sign up for a free 30min 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!

Significant digits in calculation

  1. Jan 25, 2010 #1
    Hello everyone:
    I am trying to figure out the how many significant figures (sf), should I keep in the final
    answer for multiplication and division
    1. How many hours and minutes are 20 kiloseconds?



    2.



    3. for hours: 20*10e3 / 3600 = 5.5555 hrs
    20 has only 1 significant figure (trailing zero doesn't count), hence the answer should have 1 sf, that means I should round answer to the single digits. my final answer is 6 hr. My book give 5.6 hr as the answer.
    please let me know my approach is correct

    for minutes 20*10e3 / 60 = 333.333 minutes
    keep only 1 sf in the result,that leads my answer to 333 minutes
    my book give 330 and the final answer
     
  2. jcsd
  3. Jan 26, 2010 #2

    Ouabache

    User Avatar
    Science Advisor
    Homework Helper

    Your book appears to be choosing 2 significant digits. However you could just as well choose 3 sf and still be correct. I would state what I'm using for sf, in my solution. To 3 sf, hours would be 5.56hr. If you see the answer in your book as 5.6hr, you should realize, both answers are correct.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Significant digits in calculation
  1. Significant figures (Replies: 2)

Loading...