What are the LCM and the GCF of 5 15 and 20?
In order to find the least common multiple of these three numbers, you can use the prime factorization of each number. I like to use a factor tree.
Here is a chert of the prime factors of each number.
5 5
15 5 3
20 5 2 2
Next for the LCM multiply 5 x 3 x 3 = 60
For the GCF the only number found in all three prime factors is 5 so that is your GCF
In summary,
LCM of 5,15,20 = 60
GCF of 5,15,20 = 5
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