65
5,13
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A factor tree of 1575: 1575 / \ 5 325 / \ 5 65 / \ 5 13 Answer: 5*5*5*13 or 13*53
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.
520 / \ 2 260 / \ 130 2 / \ 65 2 / \ 5 13
factor tree of 216
5 is a factor of 60 and 65.