The GCF is 2.
A greatest common factor is the largest factor between two or more numbers. For example, the greatest common factor of 10 and 12 is 2. Because the factors of 10 are 1,2,5, and 10 and the factors of 12 are 1,2,3,4,6, and 12. Since 2 is the largest factor that they both share, it is the greatest common factor.
Since 2 is a factor of 12, it is automatically the GCF.
The GCF is 1.
3
The GCF is 6.
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.
The only common factor is 1.
No. All factors of a number are less than or equal to it. Therefore the highest factor of 12 is 12. The common factor of 12 with any other number (greater than) 12 cannot be greater than the highest factor of 12 which is 12. Thus no. [The hcf(12, 30) = 6.]
12
24 & 36
The GCF is 12.