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Homework Help: Significant digits

  1. Aug 5, 2008 #1
    I have reasons to believe that my question asks to write the answer with 3 significant digits (i.e. the given numbers are with 3 digits). But there are several figures to be worked out, so I list them (for example):

    3.45
    3.89
    7.90
    ...
    10.23 or 10.2 (or even 10.20)?

    The problem is that the order of magnitude of the answers varies and I don't know what to do: write 4 significant digits (although I should know only 3) or stick with only 3, but then the number digits after the decimal point is different.
     
  2. jcsd
  3. Aug 5, 2008 #2

    Defennder

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    Homework Helper

    It should be 10.2 10.20 appears to imply that you measured down to 100th decimal place of accuracy. 10.23 is 4 sig fig.
     
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