Enter GCF or LCM numbers:
Determine GCF(18,42)
GCF = Largest factor that divides numbers
Determine the factors for 18
1,2,3,6,9,18
Determine the factors for 42
1,2,3,6,7,14
List the common factors
1,2,3,6
GCF(18,42) = 6
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
