What is the Greatest Common Factor of 343 and 355?

Greatest common factor (GCF) of 343 and 355 is 1.

GCF(343,355) = 1

We will now calculate the prime factors of 343 and 355, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 343 and 355.

How to find the GCF of 343 and 355?

We will first find the prime factorization of 343 and 355. After we will calculate the factors of 343 and 355 and find the biggest common factor number .

Step-1: Prime Factorization of 343

Prime factors of 343 are 7. Prime factorization of 343 in exponential form is:

343 = 7³

Step-2: Prime Factorization of 355

Prime factors of 355 are 5, 71. Prime factorization of 355 in exponential form is:

355 = 5¹ × 71¹

Step-3: Factors of 343

List of positive integer factors of 343 that divides 343 without a remainder.

1, 7, 49

Step-4: Factors of 355

List of positive integer factors of 355 that divides 343 without a remainder.

1, 5, 71

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 343 and 355. The biggest common factor number is the GCF number.
So the greatest common factor 343 and 355 is 1.

Also check out the Least Common Multiple of 343 and 355