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60 is the least common denominator of 3 4 5 6 10 and 15.
6 is the least common denominator of a set of fractions having 2, 3, and 6 as denominators.
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60
I do it by finding a common denominator. For example, 2/3 - 1/5. The least common denominator is 15. 2/3 = 10/15, and 1/5 = 3/15, the difference of which is 7/15. Here is another example: 5/6 - 2/3. In this case, the least common denominator is 6. 2/3 = 4/6, and 5/6 - 4/6 = 1/6.