Greatest Common Factor of 25 and 40 by Prime Factorization

Given Numbers: 25, 40
Identify the Prime Factors of 25 and 40 by Prime Factorization

• Prime Factorization of 25: 25 = 5 x 5 = 5²
• Prime Factorization of 40: 40 = 2 x 2 x 2 x 5 = 2³ x 5¹

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

• 5 is the only Prime Factor common to the Prime Factorizations of 25 and 40

Determine the least number of occurrences of 5 among the Prime Factorizations:

• 5 occurs at least 1 time in each Prime Factorization

As a result, the Greatest Common Factor (GCF) of 25 and 40 is equal to 5, which equals 5 raised to the power of its least number of occurrences or smallest exponent among the Prime Factorizations:

• GCF (25, 40) = 5¹
• GCF(25, 40) = 5

Therefore, the Greatest Common Factor of 25 and 40 by Prime Factorization = 5