What is the GCF of 20 and 28?
Highest Common Factor of two numbers x and y is the largest possible number that divides x and y exactly without any remainder.
Answer: GCF of 20 and 28 is 4
We can find the GCF of 20 and 28 by the following two methods
Methods to find GCF of 20 and 28

Listing the common factors Method

Long division Method
Method 1: GCF of 20 and 28 by Listing the Common Factors
Factors of 20: 1, 2, 4, 5, 10, and 20
Factors of 28: 1, 2, 4, 7, 14, and 28
Common Factors of 20 and 28 : 1, 2, and 4
The Greatest Common Factor 20 and 28 from the list is 4
GCF of 20 and 28 is 4
Method 2: GCF of 20 and 28 by Long Division Method

Step 1: Divide 28 by 20 and check the remainder.

Step 2: Make the remainder of the above step as the divisor and the divisor of the above step as the dividend and perform the long division again.

Step 3: Continue till you get the remainder as 0
You can find the GCF in any of the above methods but the solution will always remain the same.