The gcf is 2 because 18 only has 1, 18, 2, 9, 3, and 6 as factors, and the largest of those factors that 20 has is 2.
The lcm is 180 because 18 doesn't go into 20, 40, 60, 80, 100, 120, 140, or 160, but it does go into 180, and those are multiples of 20 in order.
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The LCM is 120 and the GCF is 2.
The LCM of 15 and 20 is 60. The GCF is 5.
The gcf of 16 and 20 is 4. The lcm of 16 and 20 is 80
20 and 100.GCF is 20, and LCM is 100.
10 and 100, respectively.