What is the greatest common factor of 16 and 18?

Answer 1

The great common factor of 16 and 18 is 2.

Method 1: Listing Factors

List all the factors of both numbers and the highest factor that is the same is the greatest common factor.

Factors of 16: 1, 2, 4, 8

Factors of 18: 1, 2, 3, 6, 9

The greatest common factor is 2.

Method 2: Prime Factorization

Find the prime factorization of each number. The prime numbers that the numbers all share multiply to the great common factor.

16 = 2 * 2 * 2 * 2

18 = 2 * 3 * 3

16 and 18 share one 2 as a prime factor. Therefore, the greatest common factor is 2.

Answer 2

18-1,2,3,6,9,18 16-1,2,4,8,16 the number 2 appears in both sets of factors, so it must be 2. Answer: 2 is the GCF of 18 and 16

The Greatest Common Factor (GCF) is: 2

Answer 3

It is: 2