What is the Greatest Common Factor of 240 and 245?

Greatest common factor (GCF) of 240 and 245 is 5.

GCF(240,245) = 5

We will now calculate the prime factors of 240 and 245, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 240 and 245.

How to find the GCF of 240 and 245?

We will first find the prime factorization of 240 and 245. After we will calculate the factors of 240 and 245 and find the biggest common factor number .

Step-1: Prime Factorization of 240

Prime factors of 240 are 2, 3, 5. Prime factorization of 240 in exponential form is:

240 = 2⁴ × 3¹ × 5¹

Step-2: Prime Factorization of 245

Prime factors of 245 are 5, 7. Prime factorization of 245 in exponential form is:

245 = 5¹ × 7²

Step-3: Factors of 240

List of positive integer factors of 240 that divides 240 without a remainder.

1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120

Step-4: Factors of 245

List of positive integer factors of 245 that divides 240 without a remainder.

1, 5, 7, 35, 49

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 240 and 245. The biggest common factor number is the GCF number.
So the greatest common factor 240 and 245 is 5.

Also check out the Least Common Multiple of 240 and 245