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Homework Help: Adding scientific notation question =)

  1. Sep 6, 2011 #1
    1. The problem statement, all variables and given/known data
    Add (9.8x10^3s)+(9.9x10^4s)+(0.017x10^6s)

    2. Relevant equations

    3. The attempt at a solution
    I have entered 125800, as well as 1.26x10^5 but the website marked both of those wrong. I've done this problem every way you could do it I think and it comes out to the same answer but the program won't accept it.
  2. jcsd
  3. Sep 6, 2011 #2


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    Staff Emeritus
    Science Advisor
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    Gold Member

    I presume this has to do with significant digits a.k.a significant figures.

    (9.8x103s) + (9.9x104s) + (0.017x106s) = (0.98x104s) + (9.9x104s) + (1.7x104s)
  4. Sep 6, 2011 #3
    So I worked out your problem also and it gave me 125800 and it just says add, but I'm guessing it doesn't want the answer but what you gave instead. Ugh I hate mastering physics... :(
  5. Sep 7, 2011 #4


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    Staff: Mentor

    You were already pointed to significant figures. Both numbers you have tried have too many.
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