Determine GCF(25,30)

GCF = Largest factor that divides numbers

Determine the factors for 25

1,5,25

Determine the factors for 30

1,2,3,5,6,10,15

List the common factors

1,5


GCF(25,30) = 5

GCF(25,30) = 5

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

(25,30)

List the first few multiples for 25

25,50,75,100,125,150,175,200,225

List the first few multiples for 30

30,60,90,120,150,180,210,240

LCM is the smallest common number:


LCM(25,30) is 150

LCM(25,30) is 150