83 is prime. No tree.
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88 | \ 44 2 | \ 22 2 | \ 11 2
81 is not prime. Its prime factorization is 3x3x3x3.
It is: 1
61 is already prime. It doesn't need a tree.
83 is a prime number so the prime factorisation of 83 is 1*83 Therefore the only possible GCF is 1 or 83. But, 83 > 55 so 83 cannot be a factor of 55. Consequently, the only possible common factor is 1. And since 1 is a GCF of all numbers, that is their GCF.