# What is the GCF of 18 and 30?

Greatest Common Factor of two or more numbers is the largest possible number which divides the given numbers exactly without any remainder.

## Answer: GCF (18,30): 6

Two methods to find the GCF of 18 and 30 are explained below.

## Methods to find GCF of 18 and 30

- GCF of 18 and 30 by Long Division
- GCF of 18 and 30 by Common Factors

### Method 1: GCF of 18 and 30 by Listing the Common Factors

Common Factors of (18,30): 1, 2, 3 and 6

Greatest Common Factor: 6

GCF (18,30): 6

### Method 2: GCF of 30 and 18 by Long Division

- Step 1: Divide 30 by 18 and check the remainder.
- Step 2: The remainder of the step 1 will act as the divisor and the divisor of the step 1 as the dividend and perform the long division again.
- Step 3: Continue untill you get remainder as 0

Both the methods above would yield the same answer for the GCF of 18 and 30

### Therefore, GCF (18,30): 6

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