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To find both of these you first need to break up the numbers into their prime factors:
18 = 2x3x3
20 = 2x2x5
Th next step is to identify any common prime factors. The only common prime factor between these two is a single 2. The GCF is therefore 2. The LCM is every other factor multiplied together:
3x3x2x2x5=180, so the LCM of 18 and 20 is 180.
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What is the LCM and the GCM of 18 and 20?
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