All nonzero numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. 3 is a common factor of 9 and 12.
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The factors that they share. Example: 30 and 42 1,2,3,5,6,10,15,30 1,2,3,6,7,14,21,42 1,2,3 and 6 are the common factors, the factors in common.
The common factors of 56 and 18 are 1 and 2.
Do you mean all the factors? I'm not sure what "common factors" is?
The common factors are: 1, 5
The common factors are: 1, 2