What is the Greatest Common Factor of 340 and 345?

Greatest common factor (GCF) of 340 and 345 is 5.

GCF(340,345) = 5

We will now calculate the prime factors of 340 and 345, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 340 and 345.

How to find the GCF of 340 and 345?

We will first find the prime factorization of 340 and 345. After we will calculate the factors of 340 and 345 and find the biggest common factor number .

Step-1: Prime Factorization of 340

Prime factors of 340 are 2, 5, 17. Prime factorization of 340 in exponential form is:

340 = 2² × 5¹ × 17¹

Step-2: 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-3: Factors of 340

List of positive integer factors of 340 that divides 340 without a remainder.

1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170

Step-4: Factors of 345

List of positive integer factors of 345 that divides 340 without a remainder.

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

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 340 and 345. The biggest common factor number is the GCF number.
So the greatest common factor 340 and 345 is 5.

Also check out the Least Common Multiple of 340 and 345