Enter GCF or LCM numbers:
Determine GCF(9,15)
GCF = Largest factor that divides numbers
Determine the factors for 9
1,3,9
Determine the factors for 15
1,3,5
List the common factors
1,3
GCF(9,15) = 3
GCF(9,15) = 3
Evaluate GCF
Since GCF ≠ 1, they are not relatively prime (co-prime)
Since GCF ≠ 1 and have a difference of two, the numbers are not twin prime
