What is the Greatest Common Factor of 40 and 156?

Greatest common factor (GCF) of 40 and 156 is 4.

GCF(40,156) = 4

We will now calculate the prime factors of 40 and 156, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 40 and 156.

How to find the GCF of 40 and 156?

We will first find the prime factorization of 40 and 156. After we will calculate the factors of 40 and 156 and find the biggest common factor number .

Step-1: Prime Factorization of 40

Prime factors of 40 are 2, 5. Prime factorization of 40 in exponential form is:

40 = 2³ × 5¹

Step-2: Prime Factorization of 156

Prime factors of 156 are 2, 3, 13. Prime factorization of 156 in exponential form is:

156 = 2² × 3¹ × 13¹

Step-3: Factors of 40

List of positive integer factors of 40 that divides 40 without a remainder.

1, 2, 4, 5, 8, 10, 20

Step-4: Factors of 156

List of positive integer factors of 156 that divides 40 without a remainder.

1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 40 and 156. The biggest common factor number is the GCF number.
So the greatest common factor 40 and 156 is 4.

Also check out the Least Common Multiple of 40 and 156