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I forgot how to do this- 8/9-4/5=
16 years ago

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Ms. Sue
When you add and subtract fractions you need a common denominator. In this problem it is 45.

- 8/9 = -40/45
-4/5 = -36/45

-40/45 - 36/45 = -76/45 = -1 31/45
16 years ago

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