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Math Help - find the difference...

  1. #1
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    find the difference...

    how to solve this..

    find the difference

    3/4 - (- 5/6)
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  2. #2
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    \displaystyle \frac{3}{4} - \left(-\frac{5}{6}\right) = \frac{3}{4} + \frac{5}{6}.

    Now get a common denominator.
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  3. #3
    Senior Member BAdhi's Avatar
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    a-(-b)=a+b
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  4. #4
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    isnt it 2?
    the answer in the book is 19/12 and idk how they got that..
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  5. #5
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    what is the common denominator of 3/4 and 5/6?
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  6. #6
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    2.. bc 2 goes in to both 4 and 6
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  7. #7
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    No, that would be a common factor, not a common denominator.

    You want the smallest number that is in both the 4 times table and the 6 times table.
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  8. #8
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    the common denominator. think how many times you multiply each denominator to get a common number?

    4 \cdot 3  =12

    6 \cdot 2=12

    can you get the rest?
    Last edited by skoker; February 8th 2011 at 04:41 PM.
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  9. #9
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    Don't confuse common denominator of fractions with the gcd (greatest common divisor, greatest common denominator, or greatest common factor). What you're really looking for is the least common multiple generally.

    To add fractions, first simplify each fraction. Then find the common denominator, and add.
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