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The gcf is 1. The only factors of 27 are 3,3, and 3. The only factors of 52 are 2, 2, and 13. So, 1 is the greatest factor.
The GCF is 4.
The GCF is 13.
The GCF is 26.
The GCF is 3.
The GCF is 1.
The GCF is 52.
The GCF is 2.
The GCF for 13 52 is 13.
The GCF of 36 and 52 = 4
The GCF of 52 and 132 is 4.