The least common denominator of 3 and 13 is 39.
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120.
15
The numbers 7, 3, and 2 share no common denominator. They are prime numbers.
1 is the only common denominator.
To compare fractions, we need to have a common denominator. In this case, the common denominator for 9, 4, and 12 is 36. Converting the fractions to have a denominator of 36, we get 20/36, 27/36, and 21/36. Therefore, in order from least to greatest: 5/9, 7/12, 3/4.