Example: 30 and 42
List the multiples.
30, 60, 90, 120, 150, 180, 210, 240
42, 84, 126, 168, 210, 252
The LCM is 210.
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24*3
The prime factors of 87 are 3 x 29
You need at least two numbers to find a GCF. The prime factorization of 207 is 3 x 3 x 23.
42=2^3*7
103 is already prime, no need for a factorization.