What is the Greatest Common Factor of 630 and 640?

Greatest common factor (GCF) of 630 and 640 is 10.

GCF(630,640) = 10

We will now calculate the prime factors of 630 and 640, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 630 and 640.

How to find the GCF of 630 and 640?

We will first find the prime factorization of 630 and 640. After we will calculate the factors of 630 and 640 and find the biggest common factor number .

Step-1: Prime Factorization of 630

Prime factors of 630 are 2, 3, 5, 7. Prime factorization of 630 in exponential form is:

630 = 2¹ × 3² × 5¹ × 7¹

Step-2: Prime Factorization of 640

Prime factors of 640 are 2, 5. Prime factorization of 640 in exponential form is:

640 = 2⁷ × 5¹

Step-3: Factors of 630

List of positive integer factors of 630 that divides 630 without a remainder.

1, 2, 3, 5, 6, 7, 9, 10, 14, 15, 18, 21, 30, 35, 42, 45, 63, 70, 90, 105, 126, 210, 315

Step-4: Factors of 640

List of positive integer factors of 640 that divides 630 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 630 and 640. The biggest common factor number is the GCF number.
So the greatest common factor 630 and 640 is 10.

Also check out the Least Common Multiple of 630 and 640