400
200,2
100,2,2
50,2,2,2
25,2,2,2,2
5,5,2,2,2,2
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The tree method is a diagram that does not display properly in this answer area.
3 is a prime number. Prime numbers don't have factor trees. The factors of 3 are 1 and 3.
40 20,2 10,2,2 5,2,2,2
Factors of 15 are: 1 3 5 and 15 of which 3 and 5 are prime factors
81 27,3 9,3,3 3,3,3,3