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The common factors of 18, 30, and 42 are: 1, 2, 3, and 6The Greatest Common Factor (GCF) is: 6
The GCF is 1.
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.
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.