What is the Greatest Common Factor of 1243 and 1254?

Greatest common factor (GCF) of 1243 and 1254 is 11.

GCF(1243,1254) = 11

We will now calculate the prime factors of 1243 and 1254, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1243 and 1254.

How to find the GCF of 1243 and 1254?

We will first find the prime factorization of 1243 and 1254. After we will calculate the factors of 1243 and 1254 and find the biggest common factor number .

Step-1: Prime Factorization of 1243

Prime factors of 1243 are 11, 113. Prime factorization of 1243 in exponential form is:

1243 = 11¹ × 113¹

Step-2: Prime Factorization of 1254

Prime factors of 1254 are 2, 3, 11, 19. Prime factorization of 1254 in exponential form is:

1254 = 2¹ × 3¹ × 11¹ × 19¹

Step-3: Factors of 1243

List of positive integer factors of 1243 that divides 1243 without a remainder.

1, 11, 113

Step-4: Factors of 1254

List of positive integer factors of 1254 that divides 1243 without a remainder.

1, 2, 3, 6, 11, 19, 22, 33, 38, 57, 66, 114, 209, 418, 627

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1243 and 1254. The biggest common factor number is the GCF number.
So the greatest common factor 1243 and 1254 is 11.

Also check out the Least Common Multiple of 1243 and 1254