# What is The LCM of 7 and 21?

For 7 and 21, the smallest number which would be perfectly divisible by them is their LCM.

## Answer: LCM of 7 and 21 is 21

## Explanation:

Least Common Multiple .is the smallest number which the given numbers divides exactly

### LCM of 7 and 21 by Listing Method

List the first few multiples of 7 and 21 and fetch the common multiples.

The smallest among the common multiples is the LCM of 7 and 21

### LCM of 7 and 21 by Common Division Method

Here we divide the numbers simultaneously with prime numbers and stop it until we don't have a prime number to further divide the given numbers.