LCM( 12, 16 ) = 48
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 12, b = 16 and GCD(12, 16) = 4.
$$ \text{LCM} (12, 16) = \frac{ 12 \cdot 16 }{ \text{GCD}(12,16)} = \frac{ 192 }{ 4 } = 48 $$