12
6 x 2
3 x 2 x 2 x 1
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The purpose of a factor tree is to divide a number into prime factors. 1 is not a prime number.
12q 12,q 6,2,q 3,2,2,q
19 is already prime; no need for a tree.
The greatest common factor of 12 and 20 is 4
No because you have to have a prime number besides 1 like 2,5,7 because every time you use a factor tree and you put a 1 as prime you keep getting one every time.So one can not be use as a factor when doing a factor tree.