The factors of 6 are:
1, 2, 3, 6
The factors of 15 are:
1, 3, 5, 15
The factors of 21 are:
1, 3, 7, 21
The common factors are:
1, 3
The Greatest Common Factor (GCF) is:
3
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The GCF of 3, 15, and 21 is 3.
The GCF is 3.
The GCF is 3.
The LCM of 7 and 15 is 105. The GCF of 7 and 15 is 1.
The GCF is 3.