What is the Greatest Common Factor of 18 and 38?
Greatest common factor (GCF) of 18 and 38 is 2.
GCF(18,38) = 2
We will now calculate the prime factors of 18 and 38, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 18 and 38.
How to find the GCF of 18 and 38?
We will first find the prime factorization of 18 and 38. After we will calculate the factors of 18 and 38 and find the biggest common factor number .
Step-1: Prime Factorization of 18
Prime factors of 18 are 2, 3. Prime factorization of 18 in exponential form is:
18 = 21 × 32
Step-2: Prime Factorization of 38
Prime factors of 38 are 2, 19. Prime factorization of 38 in exponential form is:
38 = 21 × 191
Step-3: Factors of 18
List of positive integer factors of 18 that divides 18 without a remainder.
1, 2, 3, 6, 9
Step-4: Factors of 38
List of positive integer factors of 38 that divides 18 without a remainder.
1, 2, 19
Final Step: Biggest Common Factor Number
We found the factors and prime factorization of 18 and 38. The biggest common factor number is the GCF number.
So the greatest common factor 18 and 38 is 2.
Also check out the Least Common Multiple of 18 and 38