Enter GCF or LCM numbers:

Number 1Number 2(Optional) Enter Number 3
            

Determine GCF(15,20,30)

GCF = Largest factor that divides numbers

Determine the factors for 15

1,3,5,15

Determine the factors for 20

1,2,4,5,10

Determine the factors for 30

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

List the common factors

1,5


GCF(15,20,30) = 5

Evaluate GCF

Calculate LCM for the following

(15,20,30)

List the first few multiples for 15

15,30,45,60,75,90,105

List the first few multiples for 20

20,40,60,80,100,120

List the first few multiples for 30

30,60,90,120,150

LCM is the smallest common number:


LCM(15,20,30) is 60

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