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.
Don't have a common factor greater than 1.
3 is not a common factor of 5 and 10.
If two numbers have no common factor greater then one, then their LCM is the two numbers multiplied together. Example: 9 and 14 have no common factors. Their LCM is 9 x 14, which is 126.
The GCF is the largest of the common factors.
The Greatest Common Factor (GCF) is: 1
The Greatest Common Factor (GCF) is: 5
The Greatest Common Factor depends upon the numbers for which there are common factors and it is the greatest one of them; it can be greater than 18, for example the greatest common factor of 40 and 100 is 20. The greatest common factor must be one of the factors of each of the numbers. As the factors of each number cannot be greater than that number, the greatest common factor of a set of numbers cannot be greater than the least number. If this number is not greater than 18 then the greatest common factor of the numbers cannot be greater than 18. Even if the least number is greater than 18 it is possible that the greatest common factor of a set of numbers is still not greater than 18, for example the greatest common factor of 20, 30 and 50 is 10.
No. No number can have a factor greater than itself.
The greatest common factor of 18 and 21 is 3.
When they have a factor in common greater than one.
1 is the greatest and only common factor of 15 and 38.
The greatest (and only) common factor of 4 and 5 is 1.