21
The greatest common factor of 105 and 147 is 21
Since 21 is a factor of 147, it is automatically the GCF.
The GCF is 1.
The greatest common factor of 63 and 147 is 21.
GCF(147, 189) = 21.
The Greatest Common Factor (GCF) is: 21
The GCF is 21.
The GCF is 21.
The GCF is 21.
The greatest common factor of 63, 147, and 1764 is 21.
42 prime factors -----> 2,3,7 105 prime factors -----> 3,5,7 There is 3 and 7 in common : There fore 3*7 = 21; 21 is the greatest common factor.
Just look for common factors, and divide both numbers by that common factor.7 is a common factor, so 77/147 = 11/21.