How do you make a factor tree for 65?

Answer 1

First, look for a factor. The most obvious would be 5, because the number ends in a five, so must be divisible by 5.

65/5 = 13, so the other factor will be 13.

So

65

/ \

5 13

and since both 5 and 13 are prime numbers, the tree can't go on any further.