What is the Greatest Common Factor of 842 and 856?

Greatest common factor (GCF) of 842 and 856 is 2.

GCF(842,856) = 2

We will now calculate the prime factors of 842 and 856, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 842 and 856.

How to find the GCF of 842 and 856?

We will first find the prime factorization of 842 and 856. After we will calculate the factors of 842 and 856 and find the biggest common factor number .

Step-1: Prime Factorization of 842

Prime factors of 842 are 2, 421. Prime factorization of 842 in exponential form is:

842 = 2¹ × 421¹

Step-2: Prime Factorization of 856

Prime factors of 856 are 2, 107. Prime factorization of 856 in exponential form is:

856 = 2³ × 107¹

Step-3: Factors of 842

List of positive integer factors of 842 that divides 842 without a remainder.

1, 2, 421

Step-4: Factors of 856

List of positive integer factors of 856 that divides 842 without a remainder.

1, 2, 4, 8, 107, 214, 428

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 842 and 856. The biggest common factor number is the GCF number.
So the greatest common factor 842 and 856 is 2.

Also check out the Least Common Multiple of 842 and 856