2 x 2 x 2 x 5 x 7 = 280
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It is 105 bacause 3*5*7 = 105
3 x 5 = 15 3 x 7 = 21 3 x 5 x 7 = 105, the LCM
3 x 5 = 15 2 x 3 x 5 = 30 2 x 3 x 5 = 30, the LCM
The prime factorization, using exponents, of 160 is: 25 x 5
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.