This cannot be answered because the common multiples of any two numbers are infinite.
The greatest common multiple is an infinite number and not very practical.
The GCF is 6.
The LCM is 90.
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Multiples of 6 are 6, 12, 18, 24, 30, 36... Multiples of 10 are 10, 20, 30, 40... The LCM of 6 and 10 is 30. The greatest common multiple could go into infinity.
There can never be a greatest common multiple. If a number, X, is claimed as the greatest common multiple, the 2X is a common multiple, and it is greater than X which contradicts X being the greatest.
The Least Common Multiple (LCM) for 18 20 30 is 180.
The GCF is 3.
The Least Common Multiple (LCM) for 3 18 30 is 90.