12 because I dont know
Any number can be a common factor. 3 is a common factor of 9 and 12.
The greatest common factor of 12 and 20 is 4
The Greatest Common Factor (GCF) is: 12
"Common" means "same for both". There's no such thing as a "common" factor of only one number. There has to be two or more of them, then a "common" factor is a number that's a factor of all of them.
Of 12 and what other number(s)?
The greatest factor of any number is the number itself. The greatest common factor of those numbers is 12.
Common factors of 12 and 27 are: 1 and 3.
The least common factor of 5 and 12 is the smallest number which divides both of them and it is 1, as it is for all pairs of numbers.(It is also the highest common factor of 5 and 12, as 5 and 12 only have one common factor: 1.)The least, or lowest, common multiple of a pair of numbers is the smallest number which is a multiple of both of them, which for 5 and 12 is 60.
The greatest common factor of the numbers 12 and 25 is one.
3 is a factor of 12 & a factor of 15, so it's a common factor between 12 & 15. Also, as it's the only common factor between them, in addition to 1 of course, it's the highest common factor between 12 & 15.
3
2 is a common factor