No. The gcf of 98 and 100 is 2 .
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Yes and yes.
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.
Because odd numbers don't have any even factors so they can't have any in common.
no, the GCF for 4 and 2 would be 2, which is even
If x is an odd number that is a common factor of 2 even numbers, so is 2x. So the answer is yes.