The GCF is 3.
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The greatest common factor of 18, 30, and 42 is 2.
The GCF is 15.
15, 30 and 45 have a GCF of 15.
The least common multiple is the smallest positive number that is the multiple two or more numbers. 18: 18, 36, 54, 72, 90 30: 30, 60, 90 45: 45, 90 The LCM of 18, 30 and 45 is 90.
The GCF is 45.