All numbers, except these: 1, 2, 4, 5, 8, 10, 20, 40.
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Seven: 10, 16, 20, 25, 40, 50, 80.
The numbers 2 and 40 have a GCF of 2 and an LCM of 40. So do 8 and 10.
The GCF of these numbers is 40.
The LCM is 1320.
Yes, if one of the numbers is a multiple of the other.