5
The greatest common factor is three.
The GCF is 5.
Since 15 is a factor of 75, it is automatically the GCF.
The GCF is 3.
Factors of 15: 1, 3, 5, 15 Factors of 10: 1, 2, 5, 10 GCF (15, 10) = 5
The lowest common factor of any set of positive integers is 1.
The greatest common denominator of any two or more whole numbers, such as 12 15 and 21, will always be one (1) because 'common denominator' refers to the denominators of two or more fractions or mixed numbers, not whole numbers. So, a set of whole numbers (x,x) would have to be converted to their fraction equivalents, i.e., x/1, which will always yield a denominator of 1.
Factors of 15: 1, 3, 5, 15. Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42. GCF (15, 42) = 3
The GCF is 1.
To find this you first have to identify the prime factors of each number. In this case they are: 15 = 3x5 51 = 3x17 The next step is to identify any common prime factors. In this case both numbers have a 3 as a prime factor. Therefore the HCF of 15 and 51 is 3.
If you mean greatest common multiple, there is none. For any multiple you find, I can find a bigger one.Perhaps you mean LCM or GCD?The GCD or GCF is 15and the LCM is 45.