LCM( 24, 36 ) = 72
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 24, b = 36 and GCD(24, 36) = 12.
$$ \text{LCM} (24, 36) = \frac{ 24 \cdot 36 }{ \text{GCD}(24,36)} = \frac{ 864 }{ 12 } = 72 $$