Question 645835
Reduce answer to the lowest terms 5/6+3/4
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Find a common denominator.
The product always works = 6*4 = 24
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20/24 + 18/24 = 38/24
= 19/12
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You hear about LCD, Least Common Denominator, but it's necessary to use that.  The product always works.  You might save time by not finding the LCD on a test.  You just have to reduce the result.
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If the problem says to find and use the LCD, tho, you have to do that.