As product of its prime factors: 3*3*5 = 45
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Prime factorization of 45 is 3x3x5. Prime factorization of 65 is 5x13.
The prime factorization of 45 is 3 x 3 x 5. To find an LCM it is necessary to compare and combine that prime factorization with at least one other.
45 15,3 5,3,3
45 = 32*5
45 = 32 × 5