This is the factor tree of 270: 270 / \ 3 90 / \ 3 30 / \ 3 10 / \ 2 5 The 3's, 2, 5 would be prime so you would circle them.
75 25,3 5,5,3
275 55,5 11,5,5
45 15,3 5,3,3
63 21,3 7,3,3
1,270,2,135
This is the factor tree of 270: 270 / \ 3 90 / \ 3 30 / \ 3 10 / \ 2 5 The 3's, 2, 5 would be prime so you would circle them.
77 7,11
15 3,5
23 is a prime number. No prime factorization. No tree.
13 is already prime. It doesn't need a tree.
188 94,2 47,2,2
75 25,3 5,5,3
275 55,5 11,5,5
39 3,13
2,675 2,5,125 2,5,5,25 2,5,5,5,5
56 28,2 14,2,2 7,2,2,2