No. No number can have a factor greater than itself.
No. 18 can't have a factor greater than itself.
The Greatest Common Factor (GCF) is: 5
No, the greatest common factor is never greater than the smallest number. The greatest common factor is the largest integer that divides evenly into all of the numbers listed.
The greatest common factor of 18 and 21 is 3.
The greatest common factor of two and four is 2.
1 is the greatest and only common factor of 15 and 38.
The greatest (and only) common factor of 4 and 5 is 1.
First of all, there can't be two different things that are both "greatest". You only get one. 3 is a factor of 36, and 3 is also a factor of itself. So it must be the greatest common factor of 3 and 36. If there was a greater factor common to both 3 and 36, it would have to be greater than 3.
No.
No.
No.
The greatest common factor of 2, 8, and 14 is 2. The greatest common factor of any set of numbers can't be greater than the smallest of the numbers.