The greatest common factor of 52 and 81 is 1
The greatest common factor of 56 and 81 is 1.
The greatest common factor of 81 and 189 is 27.
The greatest common factor of 40 , 81 = 1
The Greatest Common Factor of 81, 108, 117: 9
The GCF of 53 and 81 is 1.
Greatest common factor of 81 and 123 is 3.
The greatest common factor of 58 and 81 is 1.
The greatest common factor of 16 72 and 81 is 1.
The Greatest Common Factor of 81, 21, and 14 is 1.
The greatest commmon factor of 81 and 67 is 1.
The prime factors of 45 are 3, 3 and 5 The prime factors of 81 are 3, 3, 3 and 3. So two 3s are common to both numbers so 3 x 3 = 9 and that is the greatest common factor of the two.