2/3 - 3/4 div.by 5/8 + 2/3

do i need to find a common denominator for the first two fractions as ell as the next two :confused: i have not done this in a while just need to remember can you show me?

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- Jul 16th 2005, 10:35 AMAngel007simplify
2/3 - 3/4 div.by 5/8 + 2/3

do i need to find a common denominator for the first two fractions as ell as the next two :confused: i have not done this in a while just need to remember can you show me? - Jul 16th 2005, 10:49 AMMathGuru
__(2/3 - 3/4)__

(5/8 + 2/3)

first lets do what is inside the parentheses (you must find a common denominator in this case 12.

(2/3 - 3/4) = (8/12 - 9/12) = -(1/12)

(5/8 + 2/3) = (15/24 + 16/24) = -(1/24)

So now we have:

__-(1/12)__

-(1/24)

the negatives cancel.

__(1/12)__

(1/24)

and we can cross multiply

1.....24....24

-- * -- = ---

12....1.....12

so the answer is 2