Respuesta :

Answer:

GCF: 4

Step-by-step explanation:

Factors of 20: 1,2,4,5,10,20.

Factors of 28: 1,2,4,7, 14, 28.

both have 4 as a factor and it is the greatest factor they have in common so it is the GCF.

GCF of 20 and 28: 4.