Pairs with common factors other than 1.
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If the GCF of a given pair of numbers is 1, the LCM will be equal to their product. If the GCF is greater than 1, the LCM will be less than their product. Or, stated another way, if the two numbers have no common prime factors, their LCM will be their product.
4 and 9 7 and 8
The LCM for any pair of natural numbers can be as big as their product.
The LCM of two numbers will never be less than the GCF.
The LCM is their product. The LCM of 27 and 35 is 945.