The numbers 7, 3, and 2 share no common denominator. They are prime numbers.
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The least common denominator of 3 and 13 is 39.
15
120.
I suggest you do the following: 1) Find a common denominator of 5 and 7. (It need not be the least common denominator; multiplying the two denominators works for our purposes.) 2) Convert both fractions to equivalent fractions with this denominator. 3) Compare the numerators of the fractions thus converted.
To find a common denominator for 25, 27, and 45, we need to determine the least common multiple (LCM) of these numbers. The prime factorization of 25 is 5^2, 27 is 3^3, and 45 is 3^2 * 5. The LCM is the product of the highest power of each prime factor that appears in any of the numbers, which in this case is 3^3 * 5^2 = 225. Therefore, 225 is the common denominator for 25, 27, and 45.