LCM( 36, 54 ) = 108
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 36, b = 54 and GCD(36, 54) = 18.
$$ \text{LCM} (36, 54) = \frac{ 36 \cdot 54 }{ \text{GCD}(36,54)} = \frac{ 1944 }{ 18 } = 108 $$