Respuesta :
Factor of 20: 1,2,4,5,10,20
Factor of 12: 1,2,3,4,6,12
common factor of 12 and 20: 1,2,4
The Greatest Common Factor of 20 and 12 is 4
Factor of 12: 1,2,3,4,6,12
common factor of 12 and 20: 1,2,4
The Greatest Common Factor of 20 and 12 is 4