Respuesta :

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

Factors of 32: 1, 2, 4, 8, 16, 32

Common factors: 1, 2, 4 

Answer: GCF is 4 

 20: 1, 2, 4, 5, 10,
 32: 1, 2, 4, 8, 16, 32      

the answer is 4