56 28,2 14,2,2 7,2,2,2
484 242,2 121,2,2 11,11,2,2
675 225,3 75,3,3 25,3,3,3 5,5,3,3,3
720 360,2 180,2,2 90,2,2,2 45,2,2,2,2 15,3,2,2,2,2 5,3,3,2,2,2,2
39 13,3 3 x 13 = 39
78 6 x 13 (2x3) x 13 The numbers 2, 3, and 13 are prime numbers, so the factor tree is complete. An alternate version of a factor tree for 78 is: 78 2 x 39 2 x (3x13)
13 is prime. No tree.
13 is a prime number so it doesn't have a factor tree.
A factor tree of 78: 78 6 x 13 (2x3) x 13 Since 2, 3, and 13 are prime numbers, the factor tree is complete.
77 7,11
15 3,5
13 is already prime. It doesn't need a tree. 13 is prime. No tree.
1,270,2,135
13 is already prime. It doesn't need a tree.
The factor tree of 52 is 52 4 x 13 (2x2) x 13 The factor tree is finished. The prime factorization of 52 is 2 x 2 x 13.
13 is a prime number. It doesn't have a tree because its only prime factor is itself.
23 is a prime number. No prime factorization. No tree.