Question

What is the greatest common factor of 64 and 18

576

4

2

64

Answer 1

Let's start by finding all the factors of 64 and 18.

64 / 2 = 32
32 / 2 = 16
16 / 2 = 8
8 / 2 = 4
4 / 2 = 2

This means:
64 = 2 * 2 * 2 * 2 * 2 * 2 = 2^6


18 / 2 = 9
9 / 3 = 3

This means:
18 = 2 * 3 * 3


The only factor that they both have in common is 2, so 2 is the GCF.

Answer 2

The answer would be C) 2 since 2 can go into both 64 and 18 by multiplication and division.