The factors of 21 are:
1, 3, 7, 21
The factors of 44 are:
1, 2, 4, 11, 22, 44
The Greatest Common Factor (GCF) is:
1
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The GCF is 11.
The GCF of 22, 44 and 66 is 22 itself. This leaves you with 1, 2 and 3 respectively. There are no other common factors aside from 1.
The GCF is 11.
The GCF is 11.
The GCF is 22.The GCF is 22.