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Math Help - adding and subtracting fractions

  1. #1
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    adding and subtracting fractions

    this is my question:

    3 \frac{1}{5} - 1 \frac{1}{2} + 1 \frac{1}{4}

    im not sure waht to do on it so if you can help please post, thanks
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  2. #2
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    Quote Originally Posted by andyboy179 View Post
    this is my question:

    3 \frac{1}{5} - 1 \frac{1}{2} + 1 \frac{1}{4}

    im not sure waht to do on it so if you can help please post, thanks
    Hi .

    Write all these fractions as an improper fraction , then make the denominator common .

    \frac{16}{5}-\frac{3}{2}+\frac{5}{4}

    =\frac{16\times4}{5\times4}-\frac{3\times10}{2\times10}+\frac{5\times5}{4\time  s5}
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  3. #3
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    i don't understand the 16 X 4 part, could you go through it a little slower please
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  4. #4
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    Quote Originally Posted by mathaddict View Post
    Hi .

    Write all these fractions as an improper fraction , then make the denominator common .

    \frac{16}{5}-\frac{3}{2}+\frac{5}{4}

    =\frac{16\times4}{5\times4}-\frac{3\times10}{2\times10}+\frac{5\times5}{4\time  s5}
    ok . I am trying to make all the denominator common ie 20

    so for \frac{16}{5} , in order to make its denominator 20 ,

    i will need to take 5 and multiply by 4 , when i multiply the denominator by 4 , i will need to multiply the numerator by 4 as well
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  5. #5
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    oh i understand now, thanks i will do it now then get back to you with the answer
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  6. #6
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    would the answer be, 2 \frac{19}{20}
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  7. #7
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    Quote Originally Posted by andyboy179 View Post
    would the answer be, 2 \frac{19}{20}

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  8. #8
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    thanks alot for the help
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