GCF of 45 and 75

Number 1Number 2(Optional) Enter Number 3

Determine the Greatest Common Factor (GCF) of (45,75)

Determine the factors for 45 up to 45 since that is the minimum of the 2 numbers
1,3,5,9,15,45

Determine the factors for 75 up to 45 since that is the minimum of the 2 numbers
1,3,5,15,25

The common factors between them are 1,3,5,15
The greatest common factor between them is 15
Since the Greatest Common Factor of both numbers ≠ 1, the numbers are not relatively prime (co-prime)
Since the Greatest Common Factor of Both Numbers is both ≠ 1 and have a difference of two, the numbers are not twin prime
To see the LCM of these numbers, click the LCM button above