Enter GCF or LCM numbers:
Determine GCF(4,18)
GCF = Largest factor that divides numbers
Determine the factors for 4
1,2,4
Determine the factors for 18
1,2,3
List the common factors
1,2
GCF(4,18) = 2
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
Calculate LCM for the following
(4,18)
List the first few multiples for 4
4,8,12,16,20,24,28,32,36,40,44,48
List the first few multiples for 18
18,36,54,72,90
LCM is the smallest common number:
LCM(4,18) is 36
