Example: 30 and 42
The factors of 30 are:
1, 2, 3, 5, 6, 10, 15, 30
The factors of 42 are:
1, 2, 3, 6, 7, 14, 21, 42
The common factors are:
1, 2, 3, 6
The Greatest Common Factor:
GCF = 6
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The GCF of 10 and 15 is 5.
By finding their common prime numbers.
listing method , factor tree
Whatever you use, you need at least two numbers to find a GCF.
If you have two numbers, multiply them together and divide that total by the GCF. The result will be the LCM.