What is the lcm of 14 and 21?

The LCM (Least Common Multiple) of 14 and 21 is 42.

To find the LCM of two numbers, we need to find the smallest number that is a multiple of both the given numbers.

Let's list the multiples of 14: 14, 28, 42, 56, 70, 84, 98, .... And now let's list the multiples of 21: 21, 42, 63, 84, 105, ....

We can see that the smallest number that is both a multiple of 14 and 21 is 42. Therefore, 42 is the LCM of 14 and 21.