Here's one more:

Find  GCF( 140 , 900 , 3000 )

 

140 = 2^2 x 5 x 7  ...  900 = 2^2 x 3^2 x 5^2  ...  3000 = 2^3 x 3 x 5^3  ...  2^2  and 5

 

GCF( 140 , 900 , 3000 ) = 2^2 x 5 = 20

 


YOUR TURN:

Using the prime factorization method, find

GCF( 16 , 24 )
 

GCF( 15 , 45 , 60 )
 

GCF( 3780 , 14175 )