Respuesta :

to find the GCF, you have to list all factors of each number and find the first common one.

12 = 1, 2, 3, 4, 6, 12

28 = 1, 2, 4, 7, 14, 28

36 = 1, 2, 3, 4, 6, 9, 12, 18, 36

the GCF of numbers 12, 28, 36 is 4.

hope this helps, God bless!