Express each number in terms of its prime factors.
105 = 3 x 5 x 7
189 = 3 x 3 x 3 x 7
The prime factors common to both numbers are 3 and 7.
The greatest common factor is therefore 3 x 7 = 21
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The greatest common factor of 63, 84, and 105 is 21.
The GCF of 84, 105, 142, and 148 is 1.
The greatest common factor of 15 and 105 is 15.
what is the greatest common factor of 28 49 and 105
The greatest common factor of 56 and 105 is 7.