What is the Greatest Common Factor of 400 and 418?

Greatest common factor (GCF) of 400 and 418 is 2.

GCF(400,418) = 2

We will now calculate the prime factors of 400 and 418, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 400 and 418.

How to find the GCF of 400 and 418?

We will first find the prime factorization of 400 and 418. After we will calculate the factors of 400 and 418 and find the biggest common factor number .

Step-1: Prime Factorization of 400

Prime factors of 400 are 2, 5. Prime factorization of 400 in exponential form is:

400 = 2⁴ × 5²

Step-2: Prime Factorization of 418

Prime factors of 418 are 2, 11, 19. Prime factorization of 418 in exponential form is:

418 = 2¹ × 11¹ × 19¹

Step-3: Factors of 400

List of positive integer factors of 400 that divides 400 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200

Step-4: Factors of 418

List of positive integer factors of 418 that divides 400 without a remainder.

1, 2, 11, 19, 22, 38, 209

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 400 and 418. The biggest common factor number is the GCF number.
So the greatest common factor 400 and 418 is 2.

Also check out the Least Common Multiple of 400 and 418