LCM( 16, 18 ) = 144
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 16, b = 18 and GCD(16, 18) = 2.
$$ \text{LCM} (16, 18) = \frac{ 16 \cdot 18 }{ \text{GCD}(16,18)} = \frac{ 288 }{ 2 } = 144 $$