What is the Greatest Common Factor of 345 and 357?

Greatest common factor (GCF) of 345 and 357 is 3.

GCF(345,357) = 3

We will now calculate the prime factors of 345 and 357, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 345 and 357.

How to find the GCF of 345 and 357?

We will first find the prime factorization of 345 and 357. After we will calculate the factors of 345 and 357 and find the biggest common factor number .

Step-1: Prime Factorization of 345

Prime factors of 345 are 3, 5, 23. Prime factorization of 345 in exponential form is:

345 = 3¹ × 5¹ × 23¹

Step-2: Prime Factorization of 357

Prime factors of 357 are 3, 7, 17. Prime factorization of 357 in exponential form is:

357 = 3¹ × 7¹ × 17¹

Step-3: Factors of 345

List of positive integer factors of 345 that divides 345 without a remainder.

1, 3, 5, 15, 23, 69, 115

Step-4: Factors of 357

List of positive integer factors of 357 that divides 345 without a remainder.

1, 3, 7, 17, 21, 51, 119

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 345 and 357. The biggest common factor number is the GCF number.
So the greatest common factor 345 and 357 is 3.

Also check out the Least Common Multiple of 345 and 357