Example: 30 and 42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Select the highest power of each factor.
2 x 3 x 5 x 7 = 210, the LCM
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You need at least two numbers to find something in common, but I'll save you the trouble. The least common factor of any set of positive integers is 1.
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.
The least common multiple (LCM) of 40, 80, and 128 is 640. To find the LCM, you can find the prime factors of each number and then take the highest power of each prime factor that appears in any of the numbers. In this case, the prime factorization of 40 is 2^3 * 5, the prime factorization of 80 is 2^4 * 5, and the prime factorization of 128 is 2^7. Taking the highest powers, we get 2^7 * 5 = 640.
To find the least common multiple (LCM) of two numbers, you first need to find the prime factorization of each number. The prime factorization of 63 is 3^2 x 7, and the prime factorization of 180 is 2^2 x 3^2 x 5. To find the LCM, you take the highest power of each prime factor that appears in either number, which gives you 2^2 x 3^2 x 5 x 7 = 1260. Therefore, the least common multiple of 63 and 180 is 1260.
The prime factorization of 9 is 32 You need at least two numbers to find a GCF.