27 and 54
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You need at least two numbers to find a GCF. If that's 2 and 79, the GCF is 1. If that's 27 and 9, the GCF is 9.
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The GCF of 18, 4 and 27 is 1. I saw this straight away as 4 only has factors of 4, 2 and 1. 4 or 2 don't go into 27. Therefore the GCF has to be 1.
The GCF of 14 and 48 is 2. The GCF of 81 and 135 is 27. The GCF of all four is 1.
The numbers 2 and 30 have a GCF of 2 and an LCM of 30.