3, 4, and 7 are the common factors of 9 12 and 21.
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1 and 3
As factors, 1 and 3.
All integers have factors. Some integers have some of the same factors as other integers. These are known as common factors. 3 is a common factor of 9 and 12 because both 9 and 12 have 3 as a factor.
The factors of 27 are: 1, 3, 9, 27The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36The common factors are: 1, 3, 9
The GCF is 3.