The greatest common factor (GCF) is: 14.
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Greater than what? As every number has a factor of 1, there is always a common factor of 1 between any two numbers; if there are no other common factors then the greatest common factor of those numbers is 1. The factors of 154 and 42 are: 154: 1, 2, 7, 11, 14, 22, 77, 154 42: 1, 2, 3, 6, 7, 14, 21, 42 Their common factors are: 1, 2, 7, 14 Therefore their greatest common factor is 14.
The Greatest Common Factor of 28, 42, 63: 7
The Greatest Common Factor (GCF) is: 6
21 itself is the greatest common integral factor, since 21 X 2 = 42.
Greatest common factor of 42 and 280 is 14.