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How much do textbook solutions usually round?

  1. Oct 3, 2009 #1
    this is just a small question, how much do textbook solutions usually round? I just did a question that came to an equation 4*10^6 - 1 * 10^4 / (0.01/0.5(4*10^6 - 1 * 10^4))
    the calculator says like 796 000 500 000 000. something something and the textbook says that it should be 8.0 * 10^14.. well, it's close enough - but how can I ever know if it's just a rounding thing or my method was way off?

  2. jcsd
  3. Oct 3, 2009 #2


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    Hi emyt! :smile:

    (try using the X2 tag just above the Reply box :wink:)

    If it says 8.0, then it's rounding to 8.0 rather than 8.1 or 7.9 …

    so it looks as if your 7.960005… is ok. :smile:
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