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
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.