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5/4-5/6 the common denominator is 12

5/4=15/12

5/6=10/12

5/4-5/6=15/12-10/12=5/12

Another way to do it is take the fact that (a/b)-(c/d)=(ad-bc)/(bd)

(30-20)/24 = 10/24 = 5/12, the same answer. This way takes out the need for a common denominator. ■

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15y ago

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