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Greatest Common Factor (GCF) - Also known as Greatest Common Divisor (GCD)

Here's another one:

Find the GCF of
 		18
 		and
 		25
 		.
 
18 : ( 1 ) , 2 , 3 , 6 , 9 , 18
25 : ( 1 ) , 5 , 25

         GCF( 18 , 25 ) = 1

 

One more:
 

Find the GCF of
 		12
 		,
 		32
 		and
 		48
 		.
 
12 : ( 1 ) , ( 2 ) , 3 , (( 4 )) , 6 , 12
32 : ( 1 ) , ( 2 ) , (( 4 )) , 8 , 16 , 32
48 : ( 1 ) , ( 2 ) , 3 , (( 4 )) , 6 , 8 , 12 , 16 , 24 , 48

GCF( 12 , 32 , 48 ) = 4

 

YOUR TURN:

GCF( 16 , 24 )
 

GCF( 15 , 45 , 60 )
 

GCF( 20 , 23 )