# What is the Greatest Common Factor of 81 and 93?

Greatest common factor (GCF) of 81 and 93 is **3**.

GCF(81,93) = 3

We will now calculate the prime factors of **81 and 93**, than find the greatest common factor *(greatest common divisor (gcd))* of the numbers by matching the biggest common factor of 81 and 93.

## How to find the GCF of 81 and 93?

We will first find the prime factorization of 81 and 93. After we will calculate the factors of 81 and 93 and find the biggest common factor number .

### Step-1: Prime Factorization of 81

Prime factors of 81 are 3. Prime factorization of **81** in exponential form is:

81 = 3^{4}

### Step-2: Prime Factorization of 93

Prime factors of 93 are 3, 31. Prime factorization of **93** in exponential form is:

93 = 3^{1} × 31^{1}

### Step-3: Factors of 81

List of positive integer factors of 81 that divides 81 without a remainder.

1, 3, 9, 27

### Step-4: Factors of 93

List of positive integer factors of 93 that divides 81 without a remainder.

1, 3, 31

#### Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81 and 93. The biggest common factor number is the **GCF** number.

So the **greatest common factor 81 and 93** is **3**.

Also check out the Least Common Multiple of 81 and 93

#### Related Greatest Common Factors of 81

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