LCM( 16, 36 ) = 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 = 36 and GCD(16, 36) = 4.
$$ \text{LCM} (16, 36) = \frac{ 16 \cdot 36 }{ \text{GCD}(16,36)} = \frac{ 576 }{ 4 } = 144 $$