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Posted by **Kenya Ruiz** on Thursday, February 28, 2008 at 4:54pm.

1 3/4 + 4/5 and 3 1/8 - 1 1/2

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**Ms. Sue**, Thursday, February 28, 2008 at 4:57pmWhen you add and subtract fractions, you need to use their common denominators.

1 3/4 + 4/5 = 1 15/20 + 16/20 = 1 31/20 = 2 11/20

Use the same method to solve your subtraction problem. We'll be glad to check your answer.

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**Kenya Ruiz**, Thursday, February 28, 2008 at 5:09pmThen does 3 1/8 - 1 1/2 = 2 3/8??

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**Ms. Sue**, Thursday, February 28, 2008 at 5:16pmNo. Sorry.

3 1/8 - 1 4/8 = 2 9/8 - 1 4/8 = ?

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**Kenya Ruiz**, Thursday, February 28, 2008 at 5:20pmOhhhhhh ok now i understand it you have to borrow from the whole number right?

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**Ms. Sue**, Thursday, February 28, 2008 at 5:22pmRight! :-)

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**Kenya Ruiz**, Thursday, February 28, 2008 at 5:22pmOhh ok thank you so much for your help =]

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**Ms. Sue**, Thursday, February 28, 2008 at 5:28pmYou're very welcome. :-)

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