When they have a common prime factor.
When their GCF is greater than 1.
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The LCM of 4 and 6 is 12.
If the two numbers do not have any factors in common (other than 1), then the LCM is the same as the product of the two numbers. Example: LCM of 5 & 6 is 30, which is the same as the product.
If the two numbers have no common factors (other than 1), then the LCM is equal to the product of the two numbers. If they have some factors in common, then those factors need only be used once when multiplying, so the LCM will be less than the product of the two numbers.
The product of the GCF and LCM of a pair of numbers is equal to the product of the numbers.
No.