Those are known as common factors.
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Divide the factor into the number. If the answer is a whole number, the factor is a factor.
When it is a factor of that number
If one number is a factor of another number, the greatest common factor will be the lesser number. Example: 3 and 9 3 is a factor of 9 3 is a factor of 3 There can be no higher factor of a number than the number itself. Therefore, the GCF of 3 and 9 is 3.
A factor.
It is a 'factor'.