33
3,11
51
3,17
Factor tree for 51: 51 * 1 or 17 * 3 Factor tree for 255: 255 * 1 or 51 * 5
51 3,17
51 3,17
33 3, 11
33 / \ 3*11
51 3,17
51 3,17
51 3, 17
It is: 3*17 = 51
It is: 3
36 18,2 9,2,2 3,3,2,2 51 3,17
Since 61 is already prime, a factor tree is not necessary. The prime factorization of 51 is 3 x 17, which wouldn't make much of a tree. More like a factor shrub.