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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.
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