13x9= 117
13 is prime so you don't continue with 13 because nothing goes into it equally.
Then you continue with 9, and obviously 3 goes into 9 three times. (3x3=9)
Now, since nothing goes evenly into three, we stop our factor tree.
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117 39,3 13,3,3
No. 5 is not a factor of 117
It is: 13
Factor tree of 40: 40 20,2 10,2,2 5,2,2,2
Here is a factor tree of eight: 8 / \ 4 2 / \ 2 2