# What is the GCF of 18 and 42?

Greatest Common Factor of two or more numbers is the largest number which divides the given numbers perfectly leaving no remainder.

## Answer: GCF of 18 and 42: 6

Two methods to find the GCF of 18 and 42 are explained below.

## Methods to find GCF of 18 and 42

- Listing the common factors method
- Long division Method

### Method1: Obtain GCF of 18 and 42 through Listing the Common Factors

Common Factors of 18 and 42 : 1, 2, 3 and 6

The greatest common factor is 6

GCF of 18 and 42 is 9

### Method2: Obtain GCF of 18 and 42 through Long Division

- Step 1: Divide 42 by 18 and check the for the remainder(if it is 0 or not).
- 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 the division untill you get the remainder as 0

Answer: GCF of 18 and 42: 6