What is GCF of 42, 28 and 70?
GCF (Greatest Common Factor) of two or more numbers is the largest possible number which divides the given numbers exactly without any remainder.
Answer: GCF of 42, 28 and 70 is 14
Lets see how to find the GCF of 42, 28 and 70
Explanation
Methods to Find GCF of 42, 28 and 70

GCF of 42, 28 and 70 by Prime Factorization
Represent 42, 28 and 70 as a product of its prime factors.
Prime factorization of 42 is 2 × 3 × 7
Prime factorization of 28 is 2 × 2 × 7
Prime factorization of 70 is 2 × 5 × 7
The common factors in the prime factorization of 42, 28 and 70 are 2 and 7
GCF is the product of the factors that are common to each of the given numbers.
Since the common factors are 2 and 3, the GCF of 42, 28 and 70 is 14

GCF of 42, 28 and 70 by Listing the Common Factors
The factors of 42, 28 and 70 are shown below:
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42
Factors of 28: 1, 2, 4, 7, 14, 28
Factors of 70: 1, 2, 5, 7, 10, 14, 35, 70
There are four common factors of 42, 28 and 70, that are, 1, 2, 7, and 14
So, GCF of 42, 28, and 70 is 14
You can find the GCF in any of the above methods but the solution will be the same.