Posted by **Kaitlin S.** on Thursday, April 12, 2007 at 9:46pm.

Ok so I totally forgot how to find a common denominator when your adding fractions, could someone please tell me the steps to do that? :)

multiply.

Multiply the denominators together and this gives the new denominator.

Divide each denominator into the new dominator and multiply by the numerator.

3/7+5/8

new denominator is 7*8 = 56

so addition is now

(3*8)+(5*7)

___________

7*8

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