# What is the Greatest Common Factor of 51 and 68?

Greatest common factor (GCF) of 51 and 68 is 17.

GCF(51,68) = 17

We will now calculate the prime factors of 51 and 68, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 51 and 68.

GCF Calculator and
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## How to find the GCF of 51 and 68?

We will first find the prime factorization of 51 and 68. After we will calculate the factors of 51 and 68 and find the biggest common factor number .

### Step-1: Prime Factorization of 51

Prime factors of 51 are 3, 17. Prime factorization of 51 in exponential form is:

51 = 31 × 171

### Step-2: Prime Factorization of 68

Prime factors of 68 are 2, 17. Prime factorization of 68 in exponential form is:

68 = 22 × 171

### Step-3: Factors of 51

List of positive integer factors of 51 that divides 51 without a remainder.

1, 3, 17

### Step-4: Factors of 68

List of positive integer factors of 68 that divides 51 without a remainder.

1, 2, 4, 17, 34

#### Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 51 and 68. The biggest common factor number is the GCF number.
So the greatest common factor 51 and 68 is 17.

Also check out the Least Common Multiple of 51 and 68