Find the LCM of 18 and 20

The prime factorization of 18 is 2 * 3^2.

The prime factorization of 20 is 2^2 * 5.

To find the LCM, we need to consider all the prime factors and their highest powers in both numbers.

The LCM of 18 and 20 will be 2^2 * 3^2 * 5 = 180.

So, the LCM of 18 and 20 is 180.