Example: 30 and 42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Combine the factors, eliminating duplicates.
2 x 3 x 5 x 7 = 210, the LCM
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There is no need to do prime factorization as prime numbers are already prime. You do not need to find the prime numbers that when multiplied together create the number.
You need at least two numbers to find a GCF. The prime factorization of 207 is 3 x 3 x 23.
2.2.3 and
Prime factors are only found in whole numbers or integers
24*3