Respuesta :
					                   3 is the Greatest common factor. 15=3 times 5. They both have a 3. So that will be your answer. 
					                
					                
					             
					                   The greatest common factor is 3 
Because....
15. 3
1x15. 1x3
3x5. 3x1
so the greatest is 3 :)
					                
					             Because....
15. 3
1x15. 1x3
3x5. 3x1
so the greatest is 3 :)
