Posted by **Aly** on Wednesday, October 20, 2010 at 9:55pm.

Okay 5/9 + 7/9

I know you change the denominator so

5/6 = 15/18 or 3/18

7/9 = 14/18 or 2/18

which one?

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**Ms. Sue**, Wednesday, October 20, 2010 at 9:56pm
You only change the denominator when they are not the same. You don't need to change anything about those fractions -- except simplify your answer.

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**Aly**, Wednesday, October 20, 2010 at 10:02pm
I know I put them wrong I mean 5/6 + 7/9

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**Ms. Sue**, Wednesday, October 20, 2010 at 10:04pm
5/6 = 15/18

7/9 = 14/18

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**Aly**, Wednesday, October 20, 2010 at 10:07pm
which is 29/18 and so I change it to a mixed number?

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**Ms. Sue**, Wednesday, October 20, 2010 at 10:18pm
Right. And then simplify.

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**Aly**, Wednesday, October 20, 2010 at 10:22pm
is it 1 11/18???

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**Ms. Sue**, Wednesday, October 20, 2010 at 10:27pm
Right. :-)

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