The answer is:

180

Solution:

Find the prime factorization of 30

30 = 2 × 3 × 5

Find the prime factorization of 36

36 = 2 × 2 × 3 × 3

Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the LCM:

LCM = 2 × 2 × 3 × 3 × 5

LCM = 180