What is the Greatest Common Factor of 420 and 429?

Greatest common factor (GCF) of 420 and 429 is 3.

GCF(420,429) = 3

We will now calculate the prime factors of 420 and 429, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 420 and 429.

How to find the GCF of 420 and 429?

We will first find the prime factorization of 420 and 429. After we will calculate the factors of 420 and 429 and find the biggest common factor number .

Step-1: Prime Factorization of 420

Prime factors of 420 are 2, 3, 5, 7. Prime factorization of 420 in exponential form is:

420 = 2² × 3¹ × 5¹ × 7¹

Step-2: Prime Factorization of 429

Prime factors of 429 are 3, 11, 13. Prime factorization of 429 in exponential form is:

429 = 3¹ × 11¹ × 13¹

Step-3: Factors of 420

List of positive integer factors of 420 that divides 420 without a remainder.

1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210

Step-4: Factors of 429

List of positive integer factors of 429 that divides 420 without a remainder.

1, 3, 11, 13, 33, 39, 143

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 420 and 429. The biggest common factor number is the GCF number.
So the greatest common factor 420 and 429 is 3.

Also check out the Least Common Multiple of 420 and 429