LCM( 30, 36 ) = 180
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 30, b = 36 and GCD(30, 36) = 6.
$$ \text{LCM} (30, 36) = \frac{ 30 \cdot 36 }{ \text{GCD}(30,36)} = \frac{ 1080 }{ 6 } = 180 $$