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Q: What numbers can equal 198 as greatest common factor?

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Yes, the greatest common factor of a pair of numbers can equal one of the numbers if one of the numbers is a factor of the other.

No.

Yes, if one of the numbers is a factor of the other.

Only if that number is a factor of the other.

Only when one of the numbers is a factor of the other.

2 and 3

Yes, if one of the numbers is a factor of the other.

6 and 12, among others.

Lots of numbers are NOT common factors. For example, 5, 7, 100...Get the greatest common factor of both numbers. All common factors are factors of this greatest common factor. Note that all of them must needs be less than or equal to the greatest common factor. Any other number is NOT a common factor.

If one number is divisible by another (in this case, 15 is divisible by 5), then the least common multiple is equal to the larger of the numbers (15), and the greatest common factor is equal to the smaller of the numbers (5).If one number is divisible by another (in this case, 15 is divisible by 5), then the least common multiple is equal to the larger of the numbers (15), and the greatest common factor is equal to the smaller of the numbers (5).If one number is divisible by another (in this case, 15 is divisible by 5), then the least common multiple is equal to the larger of the numbers (15), and the greatest common factor is equal to the smaller of the numbers (5).If one number is divisible by another (in this case, 15 is divisible by 5), then the least common multiple is equal to the larger of the numbers (15), and the greatest common factor is equal to the smaller of the numbers (5).

Yes, if that number is a factor of the other.

Yes.

Yes.

A single number cannot have a greatest common factor because "common" refers to factors that two or more numbers have in common. You have only one number.

Yes, if you're comparing a number to itself.

Yes as for example 34 and 45

Only if the magnitudes of two numbers are the same.

The least common factor of any set of numbers is 1.

Always equal to or less than the smaller number, yes.

The product of the GCF and the LCM is equal to the product of the original two numbers.

Any two of the same numbers. The GCF and LCM of 10 and 10 is 10.

The product of the GCF and LCM is equal to the product of the original two numbers.

Yes.

The GCF can be equal to the smaller number if the smaller number is a factor of the larger one. The GCF can be equal to both numbers if they are the same number. The GCF of 10 and 10 is 10.

The GCF of the given numbers is 12