LCM( 6, 4 ) = 12
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 6, b = 4 and GCD(6, 4) = 2.
$$ \text{LCM} (6, 4) = \frac{ 6 \cdot 4 }{ \text{GCD}(6,4)} = \frac{ 24 }{ 2 } = 12 $$