What is the Greatest Common Factor of 36 and 90?
Greatest common factor (GCF) of 36 and 90 is 18.
GCF(36,90) = 18
We will now calculate the prime factors of 36 and 90, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 36 and 90.
How to find the GCF of 36 and 90?
We will first find the prime factorization of 36 and 90. After we will calculate the factors of 36 and 90 and find the biggest common factor number .
Step-1: Prime Factorization of 36
Prime factors of 36 are 2, 3. Prime factorization of 36 in exponential form is:
36 = 22 × 32
Step-2: Prime Factorization of 90
Prime factors of 90 are 2, 3, 5. Prime factorization of 90 in exponential form is:
90 = 21 × 32 × 51
Step-3: Factors of 36
List of positive integer factors of 36 that divides 36 without a remainder.
1, 2, 3, 4, 6, 9, 12, 18
Step-4: Factors of 90
List of positive integer factors of 90 that divides 36 without a remainder.
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45
Final Step: Biggest Common Factor Number
We found the factors and prime factorization of 36 and 90. The biggest common factor number is the GCF number.
So the greatest common factor 36 and 90 is 18.
Also check out the Least Common Multiple of 36 and 90