LCM( 336, 54 ) = 3024
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 336, b = 54 and GCD(336, 54) = 6.
$$ \text{LCM} (336, 54) = \frac{ 336 \cdot 54 }{ \text{GCD}(336,54)} = \frac{ 18144 }{ 6 } = 3024 $$