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Math Help - fractions

  1. #1
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    fractions

    I need someone to help me understand how to do these problems.









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  2. #2
    A riddle wrapped in an enigma
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    Your images are hard to read. You might want to try to find another method to present your work. This is what I think you have. Please confirm and others will be glad to assist.

    a) \frac{-2(18-2)}{4(5-6)}-\frac{3(27-37)}{5(7-4)}

    b) \frac{\frac{3}{4}-7}{\frac{1}{2}-\frac{4}{5}}

    c) \frac{\frac{3}{8}}{\frac{1}{4}-\frac{7}{16}}

    d) 4 \frac{3}{5}+7 \frac{1}{10}

    e) 9\left(\frac{15}{81}\right)\left(\frac{27}{15}\rig  ht)
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  3. #3
    Member Jonboy's Avatar
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    your pics are kinda blurry, so make sure i got the problem right.

    \frac{\frac{3}{4} - 7 }{\frac{1}{2} - \frac{4}{5}}
    Get like denominators on both the top and bottom of the big fraction.

    \frac{\frac{3}{4} - \frac{28}{4}}{\frac{5}{10} - \frac{8}{10}}

    Simplify: \frac{\frac{-25}{4}}{\frac{-3}{10}}

    Multiply by the reciprocal: \frac{-25}{4}\cdot\frac{-10}{3}

    = \frac{250}{12}

    = \frac{125}{6}

    C is very similar.

    On A, do what's in parenthesis first, get a like denominator and simplify.

    For: 4 \frac{3}{5}+7 \frac{1}{10}, get improper fractions, then a like denominator and finally simplify.

    For: 9\left(\frac{15}{81}\right)\left(\frac{27}{15}\rig  ht)

    Multiply straight across; numerator by numerator; denominator by denominator.

    You can think of it as: \bigg(\frac{9}{1}\bigg)\left(\frac{15}{81}\right)\  left(\frac{27}{15}\right)

    Look for cross canceling. The 15 is an obvious one.

    Then simplify as much as possible.
    Last edited by Jonboy; July 5th 2008 at 03:15 PM. Reason: technicality that's killing me
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  4. #4
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    reply

    all of what masters has is correct
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  5. #5
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    Thanks

    I want to thank both of you. I still have one question how do you write out the problems on the computer so i dont have to take pictures.
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  6. #6
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    Quote Originally Posted by MistaMista View Post
    I want to thank both of you. I still have one question how do you write out the problems on the computer so i dont have to take pictures.
    This forum allows you to enter \text{\LaTeX} (LaTeX) code directly: simply enclose it in [tex] and [/tex] tags. To learn the basics, visit the LaTex Help forum.
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  7. #7
    A riddle wrapped in an enigma
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    Quote Originally Posted by MistaMista View Post
    I want to thank both of you. I still have one question how do you write out the problems on the computer so i dont have to take pictures.
    While you're learning to post using Latex, you could simply express your problems using brackets and parentheses like this:

    a) [-2(18 - 2)] / [4(5 - 6)] - [3(27 - 37)] / [5(7 - 4)]

    b) (3/4 -7) / (1/2 -4/5)

    etc...
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