Question

What is the GCF of 28,56,and 84.
Also what is the GCF of 30,45, and 75.

Answer 1

The gcf for the numbers 28, 56 and 84 is 28

Since

28: 1, 2, 4, 7, 14, 28

56: 1, 2, 4, 7, 8, 14, 28, 56

84: 1,2,3,4,6,7,12,14,21,28,42,84

Since the biggest number they all have is 14 so the gcf is 14.

The gcf for the numbers 30, 45, and 75 is 15

30: 1,2,3,5,6,10,15,30

45: 1,3,5,9,15,45

75: 1,3,5,15,25,75

Since the biggest number they all have is 15 so the gcf is 15.

Hope this helped

Answer 2

1.) 28- all numbers listed are divisible by 28
2.) 15 (30/2, 45/3, and 75/5)