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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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Q: What is the GCF and LCM of 18 and 20 prove it?
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