The common factors of 66 and 99 are: 1, 3, 11, and 33
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33
It is: 198
99 and 148 have no prime factors in common. The only common factor of 99 and 148 is 1, and 1 is not a prime number.
The GCF is 33.
The expression 'common factor' only applies when comparing the factors of two or more numbers. The factors of 99 are :- 99, 33, 11, 9, 3 and 1 The prime factors of 99 are 32 and 11.