The GCF is 3.
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The greatest common factor of 33 and 69 is 3
33
The greatest common factor of 33 and 4 is 1. This is because 33 and 4 are prime to each other, that is; they only have one factor in common, 1.
The greatest common factor of 88 and 33 is 11. 11 x 3= 33, 11 x 8= 88
The greatest common factor of 21 and 33 is 3. The factors of 21 are 1,3,7,21 and the factors of 33 are 1,3,11 and 33 so the GCF is 3