The word "GREATEST" is a superlative adjective and that means there can be only one.GCF(912, 21) = 3.
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The greatest common factor of 21 and 77 is 7.
-- The greatest factor of 21 is 21 .-- The greatest factor of 12 is 12 .-- 1, 2, and 3 are factors of both 21 and 12 .-- The greatest common ('same for both') factor is 3 .
The Greatest Common Factor of 21, 9 is 3.
The Greatest Common Factor of 21, 63, 84: 21
The Greatest Common Factor (GCF) of 21 and 98 is 7.