What is the Greatest Common Factor of 45 and 115?

Greatest common factor (GCF) of 45 and 115 is 5.

GCF(45,115) = 5

We will now calculate the prime factors of 45 and 115, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 45 and 115.

How to find the GCF of 45 and 115?

We will first find the prime factorization of 45 and 115. After we will calculate the factors of 45 and 115 and find the biggest common factor number .

Step-1: Prime Factorization of 45

Prime factors of 45 are 3, 5. Prime factorization of 45 in exponential form is:

45 = 3² × 5¹

Step-2: Prime Factorization of 115

Prime factors of 115 are 5, 23. Prime factorization of 115 in exponential form is:

115 = 5¹ × 23¹

Step-3: Factors of 45

List of positive integer factors of 45 that divides 45 without a remainder.

1, 3, 5, 9, 15

Step-4: Factors of 115

List of positive integer factors of 115 that divides 45 without a remainder.

1, 5, 23

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 45 and 115. The biggest common factor number is the GCF number.
So the greatest common factor 45 and 115 is 5.

Also check out the Least Common Multiple of 45 and 115