What is the Greatest Common Factor of 162 and 180?

Greatest common factor (GCF) of 162 and 180 is 18.

GCF(162,180) = 18

We will now calculate the prime factors of 162 and 180, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 162 and 180.

How to find the GCF of 162 and 180?

We will first find the prime factorization of 162 and 180. After we will calculate the factors of 162 and 180 and find the biggest common factor number .

Step-1: Prime Factorization of 162

Prime factors of 162 are 2, 3. Prime factorization of 162 in exponential form is:

162 = 2¹ × 3⁴

Step-2: Prime Factorization of 180

Prime factors of 180 are 2, 3, 5. Prime factorization of 180 in exponential form is:

180 = 2² × 3² × 5¹

Step-3: Factors of 162

List of positive integer factors of 162 that divides 162 without a remainder.

1, 2, 3, 6, 9, 18, 27, 54, 81

Step-4: Factors of 180

List of positive integer factors of 180 that divides 162 without a remainder.

1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 162 and 180. The biggest common factor number is the GCF number.
So the greatest common factor 162 and 180 is 18.

Also check out the Least Common Multiple of 162 and 180