The term common factors specifically refers to the factors shared by two or more numbers. Since 168 is a single number, you could say that it shares all of its factors with itself.
The factors of 168 are: 1, 2, 3, 4, 6, 7, 8, 12, 14, 21, 24, 28, 42, 56, 84, and 168.
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The 18 factors of 468 are 1, 2, 3, 4, 6, 9, 12, 13, 18, 26, 36, 39, 52, 78, 117, 156, 234, and 468. For them to be common, they need to be compared to another set of factors.
It is: 14
14 is the GCF of 98, 168 and 182.
The GCF is 14.
The factors of 84 are: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 The factors of 98 are: 1, 2, 7, 14, 49, 98 The factors of 168 are: 1, 2, 3, 4, 6, 7, 8, 12, 14, 21, 24, 28, 42, 56, 84, 168 The common factors are: 1, 2, 7, 14 The Greatest Common Factor: GCF = 14
56 = 2*2*2*798 = 2*7*7 168 = 2*2*2*3*7 The common factors, for all three of these numbers are 2 and 7. The GCF is, therefore, 2*7 = 14.