What is the GCF of 20 and 25?
Greatest Common Factor of two numbers is the greatest possible number which divides 20 and 25 exactly without any remainder.
Answer: GCF of 20 and 25 is 5
Two methods to find the GCF of 20 and 25 are explained below.
Methods to find GCF of 20 and 25
 Listing the common factors Method
 Long division Method
Method 1: GCF of 20 and 25 by Listing the Common Factors
Factors of 20: 1, 3, 5, and 20
Factors of 25: 1, 5, and 25
Common Factors of 20 and 25: 1 and 5
Greatest Common Factor of 20 and 25 from the list = 5
GCF of 20 and 25 is 5
Method 2: GCF of 20 and 25 by Long Division Method

Step 1: Divide 25 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
The GCF of 20 and 25 will be the last divisor in the division process.
So, the last divisor is 5. This means GCF of 20 and 25 is 5
Clearly, in both the methods, the GCF of 20 and 25 is the same.