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Math Help - How do I divide Decimals?

  1. #1
    Junior Member Subliminalmessage's Avatar
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    How do I divide Decimals?

    For example:

    30.72
    9.60

    and

    22.0
    2.0
    and
    2.7
    0.9


    You don't have to answer all three, just pick one or do all three if you want, would appreciate that. Just need a simple explanation on how to divide decimals.
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  2. #2
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    Re: How do I divide Decimals?

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  3. #3
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    Re: How do I divide Decimals?

    22.0 2.0=11.0

    what is 11.0*2=???
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  4. #4
    Junior Member Subliminalmessage's Avatar
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    Re: How do I divide Decimals?

    Quote Originally Posted by skeeter View Post
    That is a long way to divide, I don't have that time but luckly division works just the same with decimals as with normal numbers apart from the decimal points which is okay because I'll have multiple choice.
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  5. #5
    Junior Member Subliminalmessage's Avatar
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    Re: How do I divide Decimals?

    Quote Originally Posted by nerdo View Post
    22.0 2.0=11.0

    what is 11.0*2=???
    Not really sure what your getting at there, I mean, that requires too much thinking when it's not needed.

    I know what I'm doing now, thanks though.
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  6. #6
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    Re: How do I divide Decimals?

    He's basically asking, what is 11x2?
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  7. #7
    Junior Member astartleddeer's Avatar
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    Re: How do I divide Decimals?

    You can multiply the decimal out of the numerator and denominator. For example:

     \frac {30.72}{9.6} \cdot \frac{100}{100} = \frac {3072}{960}\ from\ which\ simplifies\ to\ \frac{16}{5} = 3.2
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  8. #8
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    Re: How do I divide Decimals?

    I thought trailing zeros after the decimal place counts as a significant digit? So 9.60 would be 3 significant digits which means the answer is 3.20? Or is this not correct
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  9. #9
    Junior Member astartleddeer's Avatar
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    Re: How do I divide Decimals?

    Don't forget, the right hand side of the decimal point is the fractional part. So 0.2 is equal to  2 \times 10^{-1} . Which is also equal to 0.20, from which can also be regarded as  \frac{1}{5}. 20/100 simplifies to 1/5.
    Last edited by astartleddeer; June 30th 2012 at 01:51 PM.
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