Greatest Common Factor of 12 and 18 by Prime Factorization

Given Numbers: 12, 18
Identify the Prime Factors of 12 and 18 by Prime Factorization

• Prime Factorization of 12: 12 = 2 x 2 x 3 = 2² x 3¹
• Prime Factorization of 18: 18 = 2 x 3 x 3 = 2¹ x 3²

Determine the Prime Factor(s) that are common to the Prime Factorization of each number:

• 2 and 3 are Prime Factors common to the Prime Factorizations of 12 and 18

Determine the least number of occurrences of 2 and 3 among the Prime Factorizations:

• 2 occurs at least 1 time in each Prime Factorization
• 3 occurs at least 1 time in each Prime Factorization

As a result, the Greatest Common Factor (GCF) of 12 and 18 is equal to 2 x 3, which equals the product of 2 and 3 raised to the powers of their least number of occurrences or smallest exponent among the Prime Factorizations:

• GCF(12, 18) = 2¹ x 3¹
• GCF(12, 18) = 2 x 3
• GCF(12, 18) = 6

Therefore, the Greatest Common Factor of 12 and 18 by Prime Factorization = 6