214 2,107
253 11,23 Not much of a tree. More like a factor shrub.
1, 2, 107, 214
The greatest common factor of 102 and 214 is 2.
It's 35
The factor tree would be hard to show so here is the prime factorization.41 times 5
261 87,3 29,3,3
1162 581,2 83,7,2
a factor tree
30 15,2 5,3,2
68 34,2 17,2,2
99 33,3 11,3,3