88 | \
44 2
| \
22 2
| \
11 2
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88
8 x 11
(2x4) x 11
(2 x (2x2)) x 11
Since 2 and 11 are prime numbers, the factor tree is complete.
83 is a Prime number and doesn't have a factor tree since its only prime factor is itself.
83 is prime. No tree.
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.