No, factor trees are intended to find prime factors, 1 isn't prime. The process of factoring is intended to break down the number. Since factoring out 1 still leaves the original number, it isn't useful.
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109 109 x 1 This is all there is to the factor tree, because 109 is a prime number. Normally, I wouldn't use 1 in a factor tree, but I do in this case to make it clear that I have done a factor tree, since 109 is only divisible by itself and 1.
85
IT IS PRIME there is no factor tree
To find the factor tree of 89, we start by dividing 89 by its smallest prime factor, which is 89 itself. This means 89 is a prime number and cannot be factored further. Therefore, the factor tree of 89 consists of only one prime factor, which is 89.
The factor tree of 50:5025,25,5,25025,25,5,2