**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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