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Homework Help: Calculating SCIENTIFIC NOTATION by hand help .

  1. Jun 29, 2007 #1
    calculating SCIENTIFIC NOTATION by hand help plz.

    ((4*10^5)(5*10^-7)) / (2*10^-3)


    im getting 10 and the answer but its should be 100 can you plz tell me what i am so posted to do step by step please.
     
  2. jcsd
  3. Jun 29, 2007 #2

    Dick

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    4*5/2=10. Doing the exponents 5+(-7)-(-3)=1. So 10*10^1=10*10=100.
     
  4. Jun 29, 2007 #3
    If that is indeed the problem as stated, then

    Mantissa:

    (4 * 5) / 2 = 20 / 2 = 10

    Exponents:

    5 - 7 -(-3) = 8 - 7 = 1

    Answer = 10 * 10^1 = 10 * 10 = 100 = 1 * 10^2

    Do you see?
     
  5. Jun 29, 2007 #4
    thanks you very much
     
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