Enter GCF or LCM numbers:
Determine GCF(72,90)
GCF = Largest factor that divides numbers
Determine the factors for 72
1,2,3,4,6,8,9,12,18,24,36,72
Determine the factors for 90
1,2,3,5,6,9,10,15,18,30,45
List the common factors
1,2,3,6,9,18
GCF(72,90) = 18
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
(72,90)
List the first few multiples for 72
72,144,216,288,360,432,504,576
List the first few multiples for 90
90,180,270,360,450,540,630
LCM is the smallest common number:
LCM(72,90) is 360
