# How do you find the prime factorization of 20?

##### 1 Answer

Apr 8, 2016

#### Explanation:

You can separate out each prime factor in turn as follows:

#20# is divisible by#2# (i.e. even) since its last digit is even.

So divide by

#10# is divisible by#2# since its last digit is even.

So divide by

#color(blue)(5)# is prime.

So we can stop and write down

#20 = 2 xx 2 xx 5#

This can be written as a factor tree: