The gcf of a single number is the number itself. But you will usually want to take the gcf of more than one number, not of a single number.
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Because odd numbers don't have any even factors so they can't have any in common.
It CAN'T be even, since the number 2 is not a factor of the odd number. "Even" means that a number is a multiple of 2.
It is NEVER even. Because no even number can be a factor of the odd number.
No. The gcf of 98 and 100 is 2 .
Yes and yes.