What is the GCF of 12 and 40?
GCF (Greatest Common Factor) of the numbers 12 and 40 is the largest possible number which divides 12 and 40 exactly without any remainder.
Answer: GCF of 12 and 40 is 4
Let us see how to find the GCF of 12 and 40
Explanation:
We will explain the following two methods to find the greatest common factor of 12 and 40

Prime factorization Method

Listing the common factors Method
GCF of 12 and 40 by Prime Factorization
Let us represent 12 and 40 as a product of their prime factors:
Prime factorization of 12 is 3 × 2 × 2
Prime factorization of 40 is 2 × 2 × 2 × 5
Common factors = 2 × 2
GCF is the product of the factors that are common to each of the given numbers.
GCF of 12 and 40 is 4
GCF of 12 and 40 by Listing the Common Factors
Factors of 12: 1, 2, 3, 4, 6, and 12
Factors of 40: 1, 2, 4, 5, 8, 10, 20, and 40
Common Factors of 12 and 40: 1, 2 and 4
The Greatest Common Factor of 12 and 40 from the list is 4
GCF of 12 and 40 is 4
By using any of the above methods, the answer to GCF of 12 and 40 is the same.