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11 is a common factor of 55 and 121.
Their GCF is 1.The factors of 121 are 1, 11, and 121.The factors of 999 are 1, 3, 9, 27, 37, 111, 333, and 999.The only common factor, and thus the greatest common factor, is 1.
The Greatest Common Factor (GCF) of 64, 40, and 16 is 8.
The GCF is 11.
Yes. 11 is a prime number, and it is a factor of 121. Actually, it is the square root of 121, because 11 x 11 = 121, so it is the only factor of 121 besides 1 in addition to being a prime factor.