List the factors.
The factors of 21 are:
1, 3, 7, 21
The factors of 24 are:
1, 2, 3, 4, 6, 8, 12, 24
The factors of 27 are:
1, 3, 9, 27
The common factors are:
1, 3
The Greatest Common Factor:
GCF = 3
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21 and 84
The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.
The greatest common factor of 21 and 75 is 3.
The greatest common factor of 21 and 322 is 7.
The greatest common factor of 105 and 147 is 21