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How to make this fraction

  1. Feb 4, 2014 #1
    how would i convert 7.8 x 10^-3 = 39/5000 / 7.8 x 10^-3 into a fraction on my calculator?

    I know the result is 0.0078 but I don't know how to get it, thanks!
  2. jcsd
  3. Feb 4, 2014 #2
    You want to start with 7.8 x 10^-3 and end up with 39/5000 ?

    10^(-3) = 1/1000, so 7.8 x 10^-3 = 7.8/1000. Multiply the numerator and the denominator by 10 to get integers and you end up with 78/10000. Remove common factors from this and you get the answer.
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