Factor each to primes then, choose the common primes to multiply.
56=2x2x2x7
81=3x3x3x3
Greatest common is the multiplication identity 1.
The greatest common factor of 56 and 81 is 1.
The GCF is 1.
The greatest common factor for 56 and 81 is 1. There are no common factors between 81 and 56 aside from 1. This means that the GCF is 1.
The greatest common factor of 56 , 16 , 81 , 82 = 1
The greatest common factor of 52 and 81 is 1
The common factor of 56 and 81 is 1.
The greatest common factor of 40 , 81 = 1
The greatest common factor of 81 and 189 is 27.
The Greatest Common Factor of 81, 108, 117: 9
The GCF of 53 and 81 is 1.
The Greatest Common Factor of 81, 21, and 14 is 1.
The greatest common factor of 16 72 and 81 is 1.