Question

What is the GCF of 20 and 24?
A) 4
B) 6
C) 8
D) 12

Answer 1

A) 4.

Explanation:

20 = 2*2*5

24 = 2*2*2*2

Picking out the common factors, the GCF = 2*2 = 4.

Answer 2

a) 4

Explanation:

Factors of 20:

1 2 4 5 10 20

Factors of 24:

1 2 3 4 6 8 24