The factors of 143 are:
1, 11, 13, 143
The factors of 220 are:
1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220
The common factors are:
1, 11
Therefore, the Greatest Common Factor (GCF) is: 11
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The GCF of 169 and 343 is 1.
The GCF is 11.
The GCF of 52, 143, and 169 is 13.
The GCF of 65, 143, and 156 is 13.
The greatest common factor of 220, 440, and 880 is 220