51 = 3 x 17; 87 = 3 x 29. HCF is 3
Most Common Factor, Greatest Common Factor, Highest Common Factor... all the same thing.
The highest common factor is 12
10
6 is the highest common factor 6*7 = 42 6*9 = 54
The lowest common multiple is: 408 The highest common factor is: 6
The greatest common factor is the highest number that can be divided equally into two or more numbers.
The GCF is 5.
In math, a common factor usually refers to a factor that two or more numbers have in common. But, if you mean the most frequently occurring factor, that would be different. Since 1 divides every number, it would be the most common (frequently occurring) factor.
39 has a couple factors: 1, 3, 13, 39. Its greatest factor would be 39. HOWEVER, it doesn't have a common factor. You need two numbers to find what their greatest common factor is. For instance: 8 and 12. 8 has 1,2,4,8 and 12 has 1,2,3,4,6,12. The factors they have in common are 2 and 4, with 4 being their GCF. So 39 cannot have a common factor unless there is another number!
1 is a common factor for all integers.
All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. When put in a list, the largest of these is known as the greatest common factor, or GCF. Some people refer to this as the highest common factor, or HCF. Calling it the most common factor would be confusing, since people tend to think of "most common" as something that happens frequently.
The greatest common factor of any set of integers is infinite.