Question

What are the prime factors of 120

Answer 1

Do the factor tree

120

1
2
3
4
5
6
8
10
12
15
20
24
30
40
60
120

now find the prime numbers

Answer 2

I'll show you the prime factor tree that I use:
120
/ \
30 40
/ \ / \
3 10 10 4
/ \ / \ / \
2 5 5 2 2 2
I stopped at the prime numbers and those are the prime factors so the prime factors are: 2*2*2*2*5*5*3

Hope this helps :)